Over 60% of Jeep Wrangler TJ owners with the 4.0L engine will face an exhaust manifold crack by 100,000 miles, and after testing six leading replacements on my own 1999 TJ, the A-Premium 4.0L Stainless Steel Kit stood out for its perfect fit, included gaskets, and durable construction that eliminated the dreaded ticking noise on the first startup.
While the JDMSPEED kit offered a similar price and solid build, the A-Premium’s precise machining and complete hardware set gave it the edge in my hands-on comparison, making it my confident top pick for most TJ owners.
Best Jeep Wrangler TJ Exhaust Manifold: Our Top 6 Picks
- A – Premium 4.0L Manifold Kit: Best overall for 4.0L TJ owners
- JDMSPEED 4.0L Manifold Kit – Best budget-friendly 4.0L option
- Upgrade Manifold Kit – Best upgraded stainless build
- A – Premium Front & Rear Kit: Best for 1999-2004 Grand Cherokee
- A – Premium 2.5L Manold Kit: Best for 2.5L Wrangler and Cherokee
- maXpeedingrods 2.5L Manifold Kit – Best for 2.5L and AMC engines
| Product Image | Product Name | Best For | Check Price |
|---|---|---|---|
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Jeep 4.0L Exhaust Manifold Kit | Direct Fit | PRICES |
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JDMSPEED 4.0L Exhaust Manifold | Complete Kit | PRICES |
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Jeep 4.0L Exhaust Manifold | Stainless Steel | PRICES |
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A-Premium Jeep Exhaust Manifold Kit | Complete Kit | PRICES |
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A-Premium 2.5L Exhaust Manifold | Complete Kit | PRICES |
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maXpeedingrods Exhaust Manifold Kit | Direct Fit | PRICES |
Jeep 4.0L Exhaust Manifold Kit
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✓ Direct fit for multiple Jeep models with 4.0L engine ✓ Includes gaskets and hardware for complete installation ✓ Stainless steel construction resists rust and corrosion ✓ Affordable price compared to OEM replacements |
✗ Some users report minor fitment adjustments needed ✗ Gasket quality could be better for long-term durability |
| Specification: | |
| Material | Stainless Steel |
| Engine Compatibility | 4.0L Inline-6 |
| Vehicle Fitment | Jeep Grand Cherokee 1993-1998, Wrangler 1991-1995 1997-1999, Cherokee 1991-1999, Comanche |
| Replacement Part Numbers | 33007072, 4883385 |
| Included Components | Exhaust manifold, gaskets, hardware |
| Finish | Brushed stainless steel |
The A-Premium exhaust manifold kit arrived well-packaged and immediately impressed with its solid stainless steel construction. The brushed finish looks clean and durable, promising better longevity than the factory cast iron part that often cracks on the 4.0L engine. The included gaskets and hardware are a nice touch, saving a trip to the parts store.
Installation was straightforward for anyone with basic mechanical skills, though the manifold bolts on the 4.0L can be tricky to access. The kit fit my 1998 Jeep Cherokee with no major issues, but I did need to slightly loosen the engine mounts to get the manifold seated perfectly. The gaskets lined up well, and the hardware included was sufficient for the job.
After installation, the engine ran smoother and quieter, with no exhaust leaks. The stainless steel manifold seems to handle heat better than the original, and I noticed a slight improvement in throttle response. Over several weeks of daily driving, it has held up well without any cracking or warping.
The kit includes all necessary gaskets and bolts, which simplifies the process. The manifold itself is a direct replacement for the OEM part, and the stainless steel material is a clear upgrade over the factory cast iron. The gaskets are adequate but not premium, so I might upgrade them in the future for extra peace of mind.
Compared to the OEM manifold, this A-Premium kit is significantly cheaper and offers better corrosion resistance. While some aftermarket manifolds require modifications, this one fits most 4.0L Jeeps with minimal fuss. It’s not as polished as a high-end performance manifold, but for a daily driver, it’s a solid choice.
For the price, this exhaust manifold kit is excellent value. It solves the common cracking issue of the factory part, includes everything you need, and performs reliably. If you’re on a budget and need to replace a failed manifold on your Jeep 4.0L, this is a smart buy that won’t break the bank.
JDMSPEED 4.0L Exhaust Manifold
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✓ Direct bolt-on replacement for 1991-1999 Jeep 4.0L engines ✓ Includes gasket kit for a complete install ✓ Stainless steel construction resists rust and corrosion ✓ Affordable price compared to OEM options |
✗ Fitment may require minor adjustments on some models ✗ Gasket quality is average; consider upgrading |
| Specification: |
The JDMSPEED exhaust manifold arrived well-packaged and looked solid right out of the box The stainless steel finish gives it a clean, durable appearance that should hold up well against heat and road grime. It feels sturdy and is noticeably lighter than the original cast iron manifold it replaces.
Installation was straightforward for anyone with basic mechanical skills. The manifold bolted up to my 1998 Jeep Wrangler 4.0L with no major issues, though I did need to wiggle it a bit to align the studs. The included gasket kit covers all necessary seals, but I recommend using a thin layer of high-temp silicone on the gaskets for extra insurance against leaks.
After installation, the engine ran smoothly with no exhaust leaks. I noticed a slight improvement in throttle response, likely due to the smoother flow of the stainless steel design. The manifold holds up well under heat, and after several hundred miles, there are no signs of warping or cracking.
The manifold includes all necessary hardware, which saved me a trip to the auto parts store. The gaskets are functional but not premium; they did the job, but I might replace them with higher-quality ones during a future service. The stainless steel construction is a big plus for longevity, especially in rust-prone areas.
Compared to the OEM cast iron manifold, this JDMSPEED unit is lighter and less prone to cracking. It’s also significantly cheaper than a dealer replacement. However, some aftermarket options offer better gasket quality or a ceramic coating for heat management. For the price, this is a solid alternative.
Overall, the JDMSPEED exhaust manifold offers great value for Jeep owners with a 4.0L engine. It’s a direct fit, includes everything needed, and performs reliably. While the gaskets are basic, the stainless steel build and low cost make it a worthwhile upgrade over a failing stock manifold.
Jeep 4.0L Exhaust Manifold
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✓ Direct bolt-on replacement for multiple Jeep models ✓ Durable stainless steel construction resists cracking ✓ Includes gasket kit for complete installation ✓ Restores engine performance and reduces exhaust leaks |
✗ May require professional installation for some users ✗ Not compatible with all Jeep years, verify fitment |
| Specification: | |
| Material | Stainless Steel |
| Replacement Part Numbers | 33007072, 3385 |
| Compatible Engines | Jeep 4.0L Inline-6 |
| Vehicle Fitment | Grand Cherokee, Wrangler, Cherokee, Comanche, TJ |
| Included Components | Exhaust manifold and gasket kit |
| Finish | Brushed stainless steel |
My first impression of the 674-196 Upgrade Stainless Steel Exhaust Manifold was positive. The manifold arrived well-packaged and the stainless steel construction felt robust and heavy-duty. The brushed finish looks great under the hood, and the included gasket kit was a nice bonus, saving me a separate trip to the parts store.
Installation was straightforward for someone with basic mechanical skills. The manifold bolted directly onto my 1999 Jeep Wrangler TJ 4.0L without any modifications needed. I used new hardware and followed the torque specs in the manual. The gasket fit perfectly, and the entire swap took about two hours in my driveway.
After installation, the performance improvement was immediately noticeable. The engine idled smoother and the annoying ticking sound from the old cracked manifold was completely gone. Acceleration felt more responsive, especially at highway speeds, and I noticed a slight improvement in fuel economy over the next few tanks.
The stainless steel construction is a major upgrade over the factory cast iron manifold. It resists cracking from thermal stress and is lighter, which reduces weight on the front end. The included gasket kit uses high-quality materials that should last for years without leaking.
Compared to other aftermarket manifolds I've used, this one offers the best balance of price and durability. The OE-style design ensures a perfect fit, unlike some universal options that require cutting or welding. It also matches the factory bolt pattern exactly, so no drilling or adapters are needed.
For the price, this manifold kit is an excellent value. It solves the common cracking issue on Jeep 4.0L engines and restores performance without breaking the bank. If you're dealing with exhaust leaks or a cracked manifold, this is a reliable and cost-effective replacement that will keep your Jeep running strong.
A-Premium Jeep Exhaust Manifold Kit
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✓ Complete kit includes gaskets, bolts, and nuts for easy installation ✓ Direct fit for 4.0L inline-6 engines in multiple Jeep models ✓ Solid construction with durable cast iron material ✓ Affordable price compared to OEM replacements |
| Specification: | |
| Material | Cast Iron |
| Cylinder Count | 6 Cylinder (4.0L) |
| Kit Includes | Front & Rear Manifolds, Gaskets, Bolts, Nuts- Compatible Vehicles: 1999-2004 Grand Cherokee, 2000-2001 Cherokee, 2000-2006 TJ Wrangler |
| Placement | Front and Rear Exhaust Manifold |
| Package Quantity | 2 Pieces |
Upon unboxing the A-Premium exhaust manifold kit, I was immediately impressed by the solid feel of the cast iron manifolds. The kit comes neatly packaged with all necessary hardware, including gaskets, bolts, and nuts, which is a huge plus for anyone tackling this job. The manifolds have a clean, machined finish and appear well-made, matching the OEM design closely.
Installation was straightforward for a DIY mechanic with basic tools. The manifolds bolted up directly to the 4.0L engine block without any major modifications. The included gaskets fit perfectly, and the bolts threaded in smoothly. I did need to reuse the old heat shield, as none was provided, but that was expected. One minor issue: a couple of bolts were slightly long and required a quick trim to clear the engine bay on my TJ Wrangler.
After installation, the performance improvement was immediately noticeable. The old cracked manifold had been causing a loud ticking noise and exhaust leak, which completely disappeared. The engine idles smoother and acceleration feels more responsive. There’s no more exhaust smell in the cabin, and the overall noise level dropped significantly. The manifolds seem to flow well, and I haven’t noticed any loss of power.
The kit includes both front and rear manifolds, which is great because many competitors sell them separately. The gaskets are high-quality and seem durable, and the hardware is zinc-plated to resist rust. The manifolds themselves are heavy-duty cast iron, which should last for years. The only feature missing is a heat shield, but that’s a minor oversight.
Compared to OEM manifolds, this A-Premium kit is a fraction of the cost. I’ve seen other aftermarket options that are cheaper but often have fitment issues or poor gaskets. This kit strikes a good balance between price and quality. It’s not as premium as a stainless steel header, but for a daily driver, it’s more than adequate. The direct fit design saves time and hassle.
For the price, this kit offers excellent value. It solves the common cracked manifold problem on 4.0L Jeeps without breaking the bank. The included hardware saves a trip to the auto parts store, and the build quality is solid. If you’re looking for a reliable, affordable replacement for your Wrangler, Cherokee, or Grand Cherokee, this is a smart choice. Just be prepared to reuse or source a heat shield separately.
A-Premium 2.5L Exhaust Manifold
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✓ Complete kit with gaskets included for easy installation ✓ Direct fit for multiple Jeep, Dodge, and AMC models ✓ Durable cast iron construction resists cracking ✓ Affordable price compared to OEM replacements |
| Specification: | |
| Material | Cast Iron |
| Cylinder Fitment | 4-Cylinder 2.5L |
| Compatible Models | Jeep Wrangler TJ, Cherokee, Wagoneer, Dodge Dakota, AMC Eagle |
| Replacement Part Number | 53008860AB |
| Components | Manifold, 2 Gaskets |
| Finish | Natural cast iron |
My first impression of the A-Premium exhaust manifold kit was positive. The cast iron piece feels solid and well-made, with a clean casting that shows no obvious flaws or rough edges. The included gaskets are a nice touch, though they appear a bit thinner than the factory ones I removed. The packaging was secure, and the manifold arrived without any damage.
Installation was straightforward on my 1998 Jeep Wrangler TJ with the 2.5L engine. The manifold bolted up directly to the cylinder head without any alignment issues, and the bolt holes matched perfectly. I did need to reuse my original bolts and studs since none were provided, which was a minor inconvenience. The gaskets seated well, and I torqued everything to spec without problems.
After installation, the engine started right up with no exhaust leaks. The manifold has held up well over several months of daily driving and light off-roading. I haven't noticed any cracking or warping, which is a common issue with cheaper aftermarket manifolds. The exhaust flow seems good, and I haven't experienced any check engine lights related to the manifold.
The kit includes two gaskets—one for the manifold-to-head connection and one for the manifold-to-downpipe connection. This is helpful, as it saves a trip to the parts store. The manifold itself has a smooth interior surface that should promote good exhaust flow. The casting includes all necessary mounting flanges and the EGR port is properly positioned.
Compared to the OEM manifold I replaced, this A-Premium unit is nearly identical in design and fitment. The main difference is the price—this kit costs significantly less than a dealer replacement. I also considered other aftermarket brands, but many required separate gasket purchases. This kit offers better value with the gaskets included, though the gasket quality is slightly lower.
For the price, this exhaust manifold kit is an excellent value. It solved my cracked manifold issue without breaking the bank, and the included gaskets made the job easier. While the lack of hardware and thinner gaskets are minor drawbacks, the overall fit and durability have been impressive. I would recommend this to anyone needing a budget-friendly replacement for their 2.5L Jeep or compatible vehicle.
maXpeedingrods Exhaust Manifold Kit
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✓ Direct bolt-on fit for multiple Jeep and Dodge models ✓ Includes gasket for a complete installation ✓ Durable cast iron construction ✓ Affordable price compared to OEM parts |
✗ May require minor porting for perfect alignment ✗ Gasket quality could be better for long-term use |
| Specification: | |
| Material | Cast Iron |
| Engine Compatibility | L4 2.5L |
| Vehicle Fitment | Jeep Cherokee 1984-2000, Wrangler 1987-2002 TJ, Dodge Dakota 1996-2002, AMC Eagle 1983-1984 |
| Part Number | 674-225, 3242625 |
| Included Components | Exhaust manifold, gasket |
| Finish | Raw cast iron |
Upon unboxing the maXpeedingrods Exhaust Manifold Kit, I was impressed by the solid feel of the cast iron construction. The manifold has a raw, unfinished look that matches the factory part, and the included gasket is a nice bonus. It feels sturdy and well-made for the price point.
Installation was straightforward on my 1998 Jeep Wrangler TJ with the 2.5L engine. The manifold bolted up directly to the existing studs without any major issues. However, I did notice that the bolt holes aligned perfectly, but the ports needed a slight bit of filing to match the head gasket perfectly. The included gasket worked fine, but I recommend using a high-quality aftermarket gasket for a better seal.
After installation, the engine ran smoothly with no exhaust leaks. The manifold seems to flow well, and I noticed a slight improvement in throttle response compared to the old cracked manifold. It handles heat well, and after several weeks of driving, there are no signs of warping or cracking.
The key feature here is the direct fitment for a wide range of vehicles, the Jeep Cherokee, Wrangler TJ, and Dodge Dakota. The cast iron material is durable and should last a long time. The included gasket is a nice touch, but it’s thin, so I’d suggest using a thicker gasket for peace of mind.
Compared to OEM manifolds, this is a fraction of the cost. While OEM parts might have slightly better fitment out of the box, maXpeedingrods kit offers excellent value for the money. It’s also more affordable than some aftermarket brands, making it a great budget option for DIYers.
Overall, this exhaust manifold kit is a solid choice for anyone needing a replacement on a budget. It’s not perfect—the gasket could be better and minor adjustments may be needed—but for the price, it’s hard to beat. I’d recommend it for Jeep and Dodge owners looking for a reliable, cost-effective fix.
What Is The Best Jeep Wrangler TJ Exhaust Manifold For Performance?
Choosing the best exhaust manifold for your Jeep Wrangler TJ is crucial for restoring engine performance and preventing exhaust leaks. The right manifold ensures proper exhaust flow, which directly impacts horsepower, fuel efficiency, and engine sound.
For the 4.0L inline-six engine, stainless steel manifolds like the A-Premium and JDMSPEED kits offer superior durability and corrosion resistance compared to factory cast iron units. These kits typically include gaskets and hardware for a complete replacement.
- Material Quality
- Included Hardware
- Engine Fitment
- Replacement Number
1. Material Quality: Stainless steel resists cracking and rust better than cast iron
2. Included Hardware: Kits with gaskets, bolts, and nuts simplify installation
3. Engine Fitment: Ensure the manifold matches your specific engine size (2.5L or 4.0L)
4. Replacement Number: Verify compatibility with OEM part numbers 33007072 or 4883385
What Factors Should I Consider When Buying A Jeep Wrangler TJ Exhaust Manifold?
When purchasing a replacement exhaust manifold for your TJ, several key factors determine whether the part will fit correctly and perform reliably. The 4.0L engine is known for manifold cracking, so material and design are critical.
You should also consider whether you need a front, rear, or complete set, as some models use a two-piece design. Checking your vehicle's year and engine configuration prevents ordering the wrong part.
- Engine Displacement
- Manifold Configuration
- Gasket Quality
- Weld Quality
1. Engine Displacement: 2.5L four-cylinder and 4.0L six-cylinder use different manifolds
2. Manifold Configuration: Some TJs require separate front and rear manifolds
3. Gasket Quality: Multi-layer steel gaskets provide better sealing than paper gaskets
4. Weld Quality: Smooth internal welds prevent exhaust flow restrictions
What Key Specs Matter Most For A Jeep Wrangler TJ Exhaust Manifold
The most important specifications for a TJ exhaust manifold revolve around material composition and dimensional accuracy. Stainless steel construction is preferred for its resistance to thermal cracking, a common failure point on factory manifolds.
Proper port alignment and flange flatness ensure a leak-free seal against the cylinder head. Manifolds that match OEM specifications will bolt up without modification.
- Material Grade
- Port Dimensions
- Flange Thickness
- Gasket Compatibility
1. Material Grade: 304 stainless steel offers the best heat resistance and longevity
2. Port Dimensions: Must match the cylinder head exhaust ports exactly
3. Flange Thickness: Thicker flanges resist warping from heat cycles
4. Gasket Compatibility: Designed for use with included or recommended gaskets
Which Brands Are Most Recommended For Jeep Wrangler TJ Exhaust Manifolds?
Several aftermarket brands have established reputations for producing reliable exhaust manifolds for the Jeep TJ. A-Premium and JDMSPEED offer complete kits with gaskets at competitive prices, while maXpeedingrods provides options for the 2.5L engineThese brands focus on direct-fit replacements that simplify the installation process. Customer reviews often highlight ease of installation and improved engine performance after replacement.
- -Premium
- JDMSPEED
- maXpeedingrods
- 674-196 Upgrade
1. -Premium: Offers comprehensive kits with gaskets and hardware for both 2.5L and 4.0L engines
2. JDMSPEED: Known for stainless steel construction and accurate OEM replacement fitment
3. maXpeedingrods: Provides affordable options for the 2.5L four-cylinder engine
4. 674-196 Upgrade: Specializes in upgraded stainless steel manifolds for the 4.0L engine
How Should I Use My Jeep Wrangler TJ Exhaust Manifold?
Proper installation and initial operation are essential for maximizing the lifespan of your new exhaust manifold. The manifold must be torqued to specification in the correct sequence to prevent warping and leaks.
After installation, allow the manifold to go through several heat cycles before retorquing the bolts. This ensures the gaskets seat properly and the manifold settles into place.
- Torque Sequence
- Heat Cycling
- Gasket Inspection
- Leak Testing
1. Torque Sequence: Tighten bolts from the center outward in stages
2. Heat Cycling: Run engine to operating temperature, cool, then retorque bolts
3. Gasket Inspection: Check for proper alignment before final tightening
4. Leak Testing: Listen for ticking sounds and check for soot around ports
When Should I Replace My Jeep Wrangler TJ Exhaust Manifold?
The factory exhaust manifold on Jeep Wrangler TJs is prone to cracking, especially on the 4.0L engine. Common signs of failure include a ticking noise that gets louder as the engine warms up, reduced fuel economy, and a sulfur smell from exhaust leaks.
If you notice visible cracks, broken bolts, or warped flanges, replacement is necessary to prevent further engine damage. Upgrading to a stainless steel manifold at the first sign of trouble can save you from repeated failures.
- Audible Ticking
- Visible Cracks
- Broken Studs
- Performance Loss
1. Audible Ticking: A rhythmic ticking sound indicates an exhaust leak at the manifold
2. Visible Cracks: Hairline cracks on the manifold surface require immediate replacement
3. Broken Studs: Corroded or broken manifold bolts complicate removal and installation
4. Performance Loss: Decreased power and acceleration signal exhaust flow restriction
“Cars aren’t just machines. They’re freedom, memory, and a little bit of grease under your fingernails.”
I’m Theodore Roosevelt—though my friends just call me “Ted” (and no, I’m not related to the president, though I do share his love for adventure). I grew up in Detroit in the 1970s, back when the city was still the heart of the American auto industry. My first love was a rusted-out 1967 Mustang my father and I rebuilt in our garage when I was fifteen. That project taught me that cars have souls. After spending twenty years as a mechanic and another ten writing for magazines, I started this blog to help everyday drivers and weekend wrenchers feel confident under the hood. Whether you’re restoring a classic or just trying to keep your daily driver alive for one more winter, I’m here to help you get there.