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If your Acura TLX is showing signs of reduced power, increased cabin noise, or unusual exhaust smells, the exhaust manifold could be the cause. Choosing the right exhaust manifold affects engine breathing, noise levels, and long-term durability, so it matters for both daily driving and long-term reliability. This guide shortlists the top options for the Acura TLX, focusing on proper fitment and materials that stand up to heat and vibration. Below you will find the best picks for common needs and the evaluation criteria we used to select them.
Looking for other parts? See all Acura TLX parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Dorman 674-218 Driver Side Exhaust Manifold with Gaskets and Hardware |  |
| Most Popular A crowd favorite that many people choose with confidence | A-Premium Catalytic Converter and Gasket Kit for 2001–2005 Honda Civic / Acura EL 1.7L |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman 674-732 Passenger Side Exhaust Manifold Kit (includes gaskets and hardware) |  |
| Best Budget The cheapest option that still gets the job done reliably | AngyMeck Exhaust Manifold and Gasket Kit for Toyota 2.4L/2.7L (Direct Replacement) |  |
| Most Sold A high-volume bestseller chosen again and again | Northeastern Exhaust Stainless Steel Catalytic Converter for 2015–2019 Honda CR-V 2.4L |  |
| Best Value for Money The sweet spot between price and what you get | PartsFlow Left and Right Exhaust Manifold Pair with Heat Shields |  |
| Best Overall The best all-around choice for most situations | A-Premium Exhaust Manifold Kit with Gaskets and Hardware (fits select 2.4L engines) |  |
1. Dorman 674-218 Driver Side Exhaust Manifold with Gaskets and Hardware
| Material | Cast Iron |
|---|---|
| Manufacturer | Dorman Products |
| Bolt Pattern (Number of Holes) | 6 |
| Manufacturer Part Number | 674-218 |
This Dorman exhaust manifold is a cast-iron, driver-side replacement packaged with the gaskets and downpipe hardware needed for a complete repair. It is designed to match factory fit and function and is intended for bolt-on installation where the exhaust manifold has cracked, warped, or begun leaking. In real-world use the unit provides a sturdy replacement that reduces exhaust noise and restores proper exhaust routing once installed. Included hardware streamlines a single-order repair, though a few installers prefer to swap in higher-end gaskets or source manifold bolts separately on older engines. The casting appears durable and resists warping under normal operating conditions, but some reviewers note the supplied gaskets are thin on heavily corroded flanges and the exterior paint finish is utilitarian rather than premium. For reliability-focused owners who want a durable, ready-to-install factory-style manifold, this is a practical choice—just confirm fitment for the exact vehicle and consider upgraded gaskets for older engines.
Best for: Reliability-focused buyers who prioritize a durable, factory-style replacement and want a complete-box repair solution to restore quiet operation and proper exhaust routing.
Less Ideal for: Buyers seeking a cosmetically finished or performance-tuned manifold or those who prefer integrated high-end gasket kits should consider other options.
- Cast-iron construction designed to resist warping and cracking for long service life
- Includes all necessary gaskets and downpipe hardware for a one-order repair
- Engineered to match factory fit and function for straightforward installation
- Widely used part with many owner reports of good fit and reliable sealing
- Supplied gaskets may be thin and some owners prefer aftermarket one-piece gaskets
- Does not include manifold bolts, which may need to be purchased separately
- Exterior finish is basic and not cosmetically refined
Verdict A sturdy, factory-style cast-iron replacement manifold that simplifies a reliability-focused repair but may benefit from upgraded gaskets and separately sourced bolts.
2. A-Premium Catalytic Converter and Gasket Kit for 2001–2005 Honda Civic / Acura EL 1.7L
| Vehicle fitment | 2001–2005 Honda Civic and Acura EL 1.7L |
|---|---|
| Material | Stainless Steel |
| Position | Front |
| Inlet type | 6 Bolt Welded Flange |
| Outlet type | 2 Bolt Welded Flange |
This A-Premium kit replaces the front-side catalytic converter and includes the gasket and mounting hardware for a direct-fit installation on compatible 1.7L Civic and Acura EL engines. It is intended to restore emissions control and resolve check-engine codes caused by a failed converter. The unit is stainless steel with a 6-bolt inlet and 2-bolt outlet and ships with bolts, springs, and a gasket so you can complete the swap without sourcing extra parts in many cases. Real-world reports show it can clear codes and pass emissions testing when fitted correctly, and several buyers found installation straightforward with basic hand tools. Fitment can be hit-or-miss: some installers needed to reuse old springs, replace studs, or modify a brace for clearance, and a minority reported premature failures. The seller backs the product with a limited guarantee, but check local state restrictions on aftermarket converters before buying.
Best for: Convenience-driven buyers who want a mostly complete, direct-replacement catalytic converter kit to quickly fix a check-engine light and restore emissions compliance with minimal parts sourcing or trips to a parts store.
Less Ideal for: Those needing a guaranteed perfect factory-quality fit or long-term warranty support should consider OEM replacements or higher-end converters; this kit may require minor adjustments during installation.
- Direct-fit design intended for 2001–2005 Honda Civic and Acura EL 1.7L applications
- Includes gasket and mounting hardware so fewer extra parts are needed for many installs
- Stainless steel body resists corrosion better than painted or mild-steel alternatives
- EPA-compliant for federal emissions when allowed by state regulations, so it can resolve CEL and emissions failures
- Some units have fitment issues requiring minor modification or reuse of original springs
- A few buyers reported early failures and limited warranty coverage in practice
- May require replacing exhaust manifold studs or additional parts not included
Verdict A convenient, budget-friendly direct-replacement catalytic converter kit that can fix emissions issues quickly but may need minor installation tweaks for a perfect fit.
3. Dorman 674-732 Passenger Side Exhaust Manifold Kit (includes gaskets and hardware)
| Installation Type | Bolt-On |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| Manufacturer | Dorman Products |
| Position | Center |
| Bolt Pattern (Number of Holes) | 7 |
This Dorman exhaust manifold kit replaces a cracked or warped passenger-side manifold with a ductile-iron unit designed to resist heat-related warping. The kit ships with the manifold, flange and manifold gaskets, studs and nuts so you can complete a single repair without sourcing extra parts. For a performance-oriented buyer the stronger ductile-iron construction and machined exterior mean better long-term sealing and reduced risk of future leaks under higher exhaust temperatures. Installation is bolt-on and intended as a direct, reverse-engineered fit to factory interfaces, so it is used where the stock manifold has failed or when upgrading to a more durable factory-quality replacement. Notes from installers indicate the supplied gasket and some fasteners may be low quality, so many technicians fit upgraded gaskets and fresh bolts during installation to ensure a long-lasting seal. Some trimming or minor grinding may be required on certain temperature sensor or bracket clearances. The result is a solid, cost-effective replacement that addresses common cracking and stud-failure issues but benefits from using higher-grade fasteners and gaskets during installation.
Best for: Performance-oriented buyers focused on restoring factory-quality exhaust flow and durability who prioritize a stronger, heat-resistant replacement over cosmetic upgrades.
Less Ideal for: Buyers who want a plug-and-play, warranty-backed OEM part with premium included hardware and gaskets or those unwilling to swap supplied fasteners for higher-quality replacements.
- Ductile iron construction reduces risk of warping and cracking under high heat
- Includes manifold, flange and manifold gaskets plus studs and nuts for a one-box repair
- Reverse-engineered direct-fit design for straightforward bolt-on installation
- Machined exterior finish for consistent sealing surfaces
- Included gasket and some hardware are reported as lower quality and often replaced by installers
- May require minor grinding or clearance work for certain sensor brackets
Verdict A durable, ductile-iron direct-replacement manifold kit that improves resistance to heat-related failure but works best when paired with upgraded gaskets and fasteners during installation.
4. AngyMeck Exhaust Manifold and Gasket Kit for Toyota 2.4L/2.7L (Direct Replacement)
| Material | Cast Iron |
|---|---|
| Fitment Type | Direct Replacement |
| Package Contents | Exhaust Manifold, 1 Manifold Gasket |
| Placement on Vehicle | Front |
This cast-iron exhaust manifold and gasket kit is sold as a direct replacement intended to restore exhaust routing and prevent leaks. It includes the manifold and one gasket and is marketed for older Toyota 2.4L and 2.7L 4-cylinder applications as a simple swap for a worn or cracked factory manifold. The cast-iron construction provides durable heat resistance typical of factory-style manifolds, and many buyers report straightforward fitment with minor adjustment needed on some units. Expect visible machining marks and some rough edges that may require light deburring before installation. Installation is typical of exhaust manifold work and will involve removing the old manifold, transferring hardware where applicable, and torqueing to spec. The kit is a cost-focused replacement that restores function without premium finishes or refinements, so buyers should plan for basic prep and careful gasket installation to avoid leaks.
Best for: Budget-conscious owners seeking an affordable, functional replacement manifold to repair an older vehicle and return a worn or leaking exhaust system to working order.
Less Ideal for: Owners seeking a high-end or performance exhaust upgrade, a finished appearance, or guaranteed bolt‑on fitment to an Acura TLX should consider alternatives specifically made for that model.
- Cast-iron construction provides factory-quality heat resistance and strength
- Sold as a kit with manifold and gasket for a one-stop replacement
- Direct-replacement fitment advertised to match original mounting and orientation
- Well suited to budget repairs where restoring function is the priority
- Surface finish can be rough with burrs that may need deburring before use
- Not a performance or polished aftermarket manifold and lacks refinements
- Fitment may require minor adjustments on some vehicles
Verdict A no-frills, cast-iron manifold kit that restores exhaust function on a budget but is not a performance or model-specific finished upgrade.
5. Northeastern Exhaust Stainless Steel Catalytic Converter for 2015–2019 Honda CR-V 2.4L
| Compatible vehicles | 2015–2019 Honda CR-V 2.4L |
|---|---|
| Material | 409 Stainless Steel |
| Emissions approval | EPA-approved (not CARB) |
This Northeastern Exhaust catalytic converter is a vehicle-specific replacement intended to restore emissions control and exhaust flow on compatible 2015–2019 Honda CR-V 2.4L engines. It is made from 409-grade stainless steel and shipped with gaskets and a bolt kit to simplify installation for a technician or an experienced DIYer. The unit is EPA-approved for federal emissions standards, so it reduces CO, HC, and NOx while aiming to keep engine efficiency and fuel economy close to stock. Practical benefits include corrosion resistance from the stainless construction and a direct-fit design that generally avoids welding or major modifications. Limitations include the lack of CARB approval, which means it cannot be used in states with stricter emissions rules, and 409 stainless is less corrosion-resistant than higher grades like 304. Also the one-time replacement warranty is limited and does not cover installation costs or consequential damage.
Best for: A risk-averse mainstream buyer seeking a direct-fit, factory-replacement style catalytic converter to restore emissions compliance and normal engine behavior without performance modifications.
Less Ideal for: Anyone who needs a CARB-compliant part for use in California or Colorado or buyers seeking the highest-grade stainless construction for maximum long-term corrosion resistance.
- Vehicle-specific direct-fit design reduces need for modification during replacement.
- Constructed from 409 stainless steel for improved resistance to rust compared with mild steel.
- EPA-approved for federal emissions standards to restore emissions control on non-CARB jurisdictions.
- Includes gaskets and a bolt kit to simplify installation and reduce parts sourcing.
- Not CARB-compliant so it cannot be sold for use in states with stricter emissions regulations.
- 409 stainless steel is durable but less corrosion-resistant than premium stainless grades like 304.
- Warranty is a one-time replacement and excludes labor, shipping, and installation-related costs.
Verdict A straightforward, EPA-approved direct-fit catalytic converter for 2015–2019 CR-V 2.4L owners who want a factory-style replacement but not for CARB-restricted states.
6. PartsFlow Left and Right Exhaust Manifold Pair with Heat Shields
| Manufacturer | PartsFlow |
|---|---|
| Material | Cast Iron |
| Placement on Vehicle | Left, Right, Front |
| Manufacturer Part Number | 14ZAABIFE |
| Replacement OEM Number | 674-156, 674-157,10045315, 14093658, 14102016 |
These PartsFlow exhaust manifolds are a cast-iron left and right pair supplied with heat shields and sold as a direct replacement set. In typical use they bolt to the cylinder heads and route exhaust gases into the factory exhaust system while the heat shields limit radiant heat to surrounding components. For a practical optimizer they provide a full-side replacement that keeps installation straightforward when the rest of the exhaust system remains factory-style. The cast-iron construction is durable and tolerates high exhaust temperatures, and customer feedback suggests many buyers find fit and finish acceptable for routine repairs. Limitations to consider are that fitment can be vehicle-specific and may require minor exhaust repositioning or additional hardware not supplied, so expect some adaptation on older or modified systems. The finish and packaging show occasional cosmetic imperfections and there are a few reports of cracking when stressed, so this is best for drivers who prioritize cost-effective repairs over premium performance gains.
Best for: Practical optimizers seeking a budget-conscious, full replacement that restores factory-style exhaust routing without premium performance upgrades.
Less Ideal for: Drivers looking for a performance-oriented manifold or an exact factory-quality match for a vehicle with extensive exhaust modifications should consider higher-end or vehicle-specific options.
- Sold as a complete left and right pair for one-stop replacement
- Cast-iron construction suitable for high-temperature exhaust duty
- Includes heat shields to reduce radiant heat to nearby components
- Multiple customer reports of straightforward bolt-on fit on compatible vehicles
- Not guaranteed to fit without modification on all models and may lack some installation hardware
- Some units show cosmetic chips or early cracking in a few customer reports
Verdict A cost-focused cast-iron pair that restores exhaust routing cheaply but may need minor adjustments for a perfect fit.
7. A-Premium Exhaust Manifold Kit with Gaskets and Hardware (fits select 2.4L engines)
| Brand | A-Premium |
|---|---|
| Manufacturer Part Number | APEMD116 |
| OEM Part Number | 674-940, 12609823 |
| Fitment note | Compatible with certain 2.4L L4 applications (verify fitment) |
This exhaust manifold kit provides a direct replacement-style manifold plus manifold and flange gaskets and the bolts and nuts needed for installation. It is designed to restore proper exhaust routing and reduce exhaust leaks that cause noise, poor idle, or cabin fumes. Typical use is a like-for-like repair when the original manifold has cracked or the gasket has failed. Customers report fitment that matches factory geometry and that the included gaskets are of good quality, which simplifies installation and avoids an extra trip for missing parts. The casting shows minor surface blemishes on some units but those do not affect function. A-Premium claims corrosion and heat resistance and backs the part with a one-year guarantee. Note that long-term durability on 2.4L Ecotec-style engines can vary and some buyers prefer an upgraded or reinforced manifold for higher-mileage vehicles or aggressive driving conditions.
Best for: A balanced, all-round buyer seeking a complete, factory-quality replacement to restore normal exhaust operation without upgrading to performance parts.
Less Ideal for: Drivers who plan to push the engine hard, who need a reinforced high-mileage solution, or who want a performance-oriented manifold should consider heavy-duty or upgraded alternatives instead.
- Includes manifold gasket, flange gasket and mounting bolts and nuts so you have all basic hardware for installation.
- Fits factory mounting points and matches OEM geometry for straightforward replacement.
- Constructed from solid metal casting intended to resist heat and corrosion for typical service life.
- One-year unlimited-mileage guarantee offers short-term peace of mind.
- Not marketed as a reinforced or heavy-duty upgrade for engines that have recurrent manifold cracking.
- Some castings show small blemishes that are cosmetic rather than structural.
- Long-term lifespan may be shorter than higher-end OEM or upgraded aftermarket manifolds on high-mileage engines.
Verdict A practical, all-in-one replacement manifold kit that fits factory geometry and includes gaskets and hardware, but it is not a heavy-duty upgrade for high-mileage or performance use.
Choosing the Right Acura TLX Exhaust Manifold: Key Factors to Consider
Fitment and Flange Alignment
Precise fitment is essential because exhaust manifold flanges must align exactly with the cylinder head and downstream components. Even small misalignments can lead to exhaust leaks, stress on mounting bolts, and accelerated gasket wear.
When evaluating fitment, look for manifolds that specify compatibility with the Acura TLX model year and engine code. Proper flange thickness and flatness matter for achieving a consistent seal without warping under heat. Good alignment also simplifies installation and reduces the chance you will need to modify studs, bolts, or mating surfaces.
Material and Heat Resistance
The material determines how well a manifold withstands high exhaust temperatures and thermal cycling. Cast iron is common for durability and resistance to cracking, while certain stainless steels offer lighter weight and better corrosion resistance.
Consider how the material handles thermal expansion and whether it incorporates design features to prevent stress fractures. A material that resists warping and corrosion will maintain a stable seal and extend service life, particularly in climates with wide temperature swings or frequent short trips that create aggressive thermal cycles.
Gasket Surface and Sealing Design
A reliable sealing interface reduces the risk of exhaust manifold leaks that cause ticking noises, reduced performance, and increased emissions. The gasket surface should be smooth, flat, and designed to interface with the OEM gasket style used on the Acura TLX.
Some manifolds include integrated sealing flanges or stepped surfaces to accommodate OEM gaskets. Pay attention to whether new gaskets or hardware are required and whether the manifold design helps compress the gasket evenly across the flange, which impacts long-term leak resistance.
Welding and Manufacturing Quality
High-quality welding and consistent manufacturing tolerances reduce weak points where cracks can develop. Manifolds that use proven welding techniques and have clean, reinforced joins will typically resist cracking under vibration and thermal stress.
Inspect whether the design includes reinforcement at stress points and whether seams are ground and finished to reduce stress concentrators. Products with consistent manufacturing tolerances also tend to align better and require fewer post-installation adjustments.
Compatibility With Sensors and Accessories
Modern vehicles like the Acura TLX have oxygen sensors, heat shields, and mounting brackets that must be accommodated. A manifold that preserves factory sensor ports and accessory mounts avoids the need to relocate sensors or fabricate adapters.
Ensure the manifold provides correct sensor bung placement and maintains clearance for heat shields and steering components. Compatibility in this area reduces installation complexity and helps the vehicle’s engine control systems function as designed.
Installation Complexity and Maintenance
Installation difficulty affects labor time and the risk of improper fastening that can lead to leaks. Some manifolds are direct bolt-on replacements, while others may require removal of nearby components or careful torque sequencing to avoid warping.
Consider whether the manifold requires new nuts, studs, or gaskets, and whether it includes instructions or hardware. Also think about long-term serviceability, such as access to bolts for future maintenance and whether the design minimizes areas where carbon buildup or corrosion can trap moisture and accelerate deterioration.
FAQ
What are common exhaust manifold symptoms on an Acura TLX?
Common signs often include a sharp ticking or tapping noise during engine start or acceleration, reduced engine responsiveness, and a noticeable exhaust odor in the cabin. Symptoms can vary with engine temperature, often worsening as components heat and the metal expands. These signs usually indicate a sealing issue or a crack that should be inspected promptly.
How do I diagnose an exhaust manifold leak on my Acura TLX?
Diagnosis typically begins with a visual inspection for soot, cracks, or warped flanges at the joint between the manifold and cylinder head. With the engine running, carefully listen for localized ticking noises near the exhaust port. Professional shops can use smoke or pressure testing to confirm a leak without removing multiple components. Always follow safety precautions when working near a running engine.
When should I replace the exhaust manifold gasket versus the entire manifold?
If the gasket is the only issue and the flange surfaces are flat and undamaged, replacing the gasket can restore a seal. However, if there is visible cracking, warped flanges, or recurring leaks even after gasket replacement, a full manifold replacement is usually the more durable solution. The decision depends on the condition of the mating surfaces and extent of any metal damage.
Can a cracked exhaust manifold be repaired, or does it need replacement?
Minor cracks in some materials may be weldable, but welding is not always a reliable long-term fix because heat cycling can reopen the crack. Repair feasibility depends on crack location, material type, and access for proper welding and stress relief. For many drivers, replacing a cracked manifold provides a more dependable outcome.
How does material choice affect exhaust manifold longevity?
Material affects resistance to heat, corrosion, and thermal fatigue. Cast iron tends to be robust against high temperatures and less prone to immediate corrosion, while certain stainless steels resist rust and can be lighter. Material choice influences how the manifold responds to repeated heating and cooling, which in turn affects its lifespan and susceptibility to cracks or warping.
Will replacing the exhaust manifold improve performance on my Acura TLX?
Replacing a damaged or leaking manifold can restore lost power and improve throttle response because it removes leaks and restores proper exhaust flow. Upgrading to a better-designed direct-fit replacement may offer incremental improvements in flow and sound, but gains depend on the overall exhaust system and engine condition.
How We Chose the Best Acura TLX Exhaust Manifold
We focused on practical, vehicle-specific criteria to identify manifolds suited for the Acura TLX. Key evaluation factors included accuracy of fit and flange alignment to ensure a reliable seal to the cylinder head, material and thermal resistance for long-term durability under exhaust temperatures, and precision of port matching to preserve exhaust flow and avoid backpressure issues. We also considered manufacturing quality such as welding standards and stress-relief features, plus gasket sealing surfaces and bolt pattern consistency to reduce the chance of leaks. Ease of installation and compatibility with existing sensors and mounting points were reviewed to minimize labor and modification needs. We excluded options that required extensive modification, headers designed strictly for racing use, or products lacking clear vehicle-specific fitment information. The list prioritizes parts that balance durability, fit, and real-world serviceability for Acura TLX owners.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing an exhaust manifold for an Acura TLX, prioritize accurate fitment, durable materials, and a sealing design that matches the factory interface. Those elements most directly affect leak prevention, engine breathing, and long-term reliability. Balance ease of installation and compatibility with sensors to avoid unnecessary labor or modifications. Expect tradeoffs between materials and weight versus robustness. Focus first on options that eliminate existing symptoms and restore proper sealing. After that, consider durability and serviceability to reduce the chance of repeat repairs.
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