Crown Automotive 52040278K Complete Exhaust Kit for 87-90 Wrangler YJ with 4.2L Engine
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Complete Exhaust System Replacement: Provides a comprehensive OE-style solution for restoring the factory exhaust system from front to rear.
Vehicle-Specific Direct Fit: Engineered specifically for 1987–1990 Jeep Wrangler YJ models equipped with the 4.2L engine.
Factory-Style Exhaust Performance: Designed to restore proper exhaust flow, engine efficiency, and overall drivability.
Heavy-Duty Steel Construction: Manufactured from durable materials to withstand heat, vibration, corrosion, and everyday driving conditions.
Simplified Exhaust Restoration: Includes the major exhaust system components needed to replace worn, damaged, or aging factory parts.
CARB Notice
- Legal in California, or other states adopting California emissions standards, only for racing vehicles that may never be used, registered or licensed for use, upon a highway. Can not be shipped to California residents.
Bring your Wrangler's exhaust system back to life with the Crown Automotive Complete Exhaust Kit. Designed for 1987–1990 Jeep Wrangler YJ models equipped with the 4.2L inline-six engine, this comprehensive exhaust package provides an OE-style replacement for vehicles with rust, exhaust leaks, damaged components, or years of wear and tear. By replacing the system as a complete assembly, owners can restore performance, reliability, and exhaust efficiency with confidence.
Engineered to match factory specifications, the kit is designed for proper fitment and seamless integration with the original exhaust mounting locations. The OE-style design helps maintain appropriate exhaust flow characteristics, supporting engine performance and smooth operation while reducing unwanted exhaust leaks and noise. Constructed from durable materials that withstand high temperatures and demanding driving conditions, the system is built for long-term reliability. Whether completing a restoration project or performing necessary maintenance, the Crown Automotive Complete Exhaust Kit provides a dependable solution for returning your YJ to factory-style operation.
- Engine Size: 4.2L 258ci I-6
- Shipping Weight: 19lb
- Shipping Dimensions: 30in x 10in x 10in (L x W x H)
Jeep Wrangler (YJ)
- 1990 Jeep Wrangler (YJ)
- 1989 Jeep Wrangler (YJ)
- 1988 Jeep Wrangler (YJ)
- 1987 Jeep Wrangler (YJ)
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Crown Automotive Complete Exhaust Kit Reviews
I have an 87.
Required the pipe from the cat to the muffler to be cut 1.5"
The "hanger" rubber provided for the rear most mount doesn't apply to an 87. I had to cut the factory exhaust off the factory hanger, then extend factory hanger to make it hang lower.
The outlet near the top is wrongly called an o2 sensor port in another review. That is for the pulse air system's up stream inlet. It is curiously threaded, but you use an exhaust clamp to connect your existing pulse air tube to.
The cat requires you to cut the air inlet in order to hook the pulse air tube up. My cat was not factory, so I'm not sure how that was originally accomplished, I had a rubber coupling hose clamped.
I also had to extend my down stream pulse air tube. This might have been caused by me having an aftermarket cat before using this kit.
This isn't necessarily a simple few hour job.
At the bare minimum you need to drop your skid plate (This involves supporting the transmission) and take down your rear track bar. I had to also drop the passenger side spring and shock just to access the rear track bars bolt.
The exhaust seems good enough, and the over axle section looks like it should last a good long time since it was aluminized after welding.
Went in pretty easily given I was doing it by myself. Fits well. Prior review complained about muffler being reversed. Not an issue. Goes in as it is intended. One star off for no flange bolts. Also should have a bolt to cap O2 hole because early models (mine is 1988 YJ) have O2 sensor in manifold and not in exhaust.
Went in fairly easy. Seems to be a direct fit. Does not come with flange bolts for the catalytic converter. 1988 YJ
