:: Jeep Wrangler 3.8/4.0L Headers & Exhaust Systems ::

Jeep vehicles are know for being rugged machines that can go just about anywhere. With rugged designs and time proven engineering, these purpus built vehicles are right at home when venturing off the beaten path from Moab to the Rubicon. Most Jeeps are powered by the trusty 4.0L I-6. Unfotunately, the 4.0L has always suffered from an inefficient and crack prone exhaust. Many Jeep enthusiasts know the frustration of a cracked factory exhaust manifold or a trail damaged exhaust system - not to mention a need for more torque. Until now, there hasn't been a quality solution to these issues. JBA's engineering team spent over 2 years developing the most durable and best performing header and exhaust system possible. These systems are designed for the hardcore user to get you the power and torque needed to conquer anything in your path.

JBA Cat4ward® Headers :: Wrangler 3.8/4.0L

If you own a Jeep powered by the 4.0L I-6, you know that it is a solid dependable powerplant. Depending on what year vehicle you have, you may also know that it is short on power and torque and has a tendancy to crack exhaust manifolds. JBA has spent countless hours developing and testing the ultimate solution for these power and durability challenges. JBA's unique headers designes are crafted from the highest grade materials to ensure lasting performance for your Jeep. The head flange is a one-piece design that is CNC laser cut from 1/2" steel plate to guarantee a tight seal with the head. JBA's collector features a 3/8" flange secured with a 360 degree weld for maximum strength. Each kit includes high quality hardware and gaskets for a professional no-leak installation. Don't settle for low grade materials and inferior designs.



*This Product has been granted a California Air Resources Board (CARB) “E.O” (Executive Order) Exemption, or is considered a Direct Replacement or Consolidated Replacement part. It is 50 State Legal when installed on the appropriate vehicle per the Manufacturer Application guide and Installation Instructions.


Click to enlarge
91-99 Jeep Wrangler 4.0L - p/n 1526S

:: Header Features ::
  • 50 State Smog Legal (EO# D-57-32)
  • 1/2" CNC laser-cut head flange
  • Mandrel-bent stainless steel primary tubes
  • Provisions for all factory emissions equipment
  • Premium quality hardware included
  • Optional ceramic coating (thermal barrier)


:: Header Benefits ::
  • Improved throttle response
  • Reduced under hood temperature
  • Increased passing power
  • Increased low-end torque
  • Makes engine more sensitive to upgrades
  • Improved fuel economy*

* results may vary


Headers :: Jeep Wrangler 3.8/4.0L


Stainless Steel

Silver Ceramic

Titanium Ceramic

07-11, 3.8L Cat4ward® Shorty




00-06, 4.0L Cat4ward® Shorty




91-99, 4.0L Cat4ward® Shorty




: : Explanation of available header finishes Click here : :

JBA Exhaust Systems::

Click to Enlarge
2004 Jeep Wrangler with p/n 40-1501 installed

JBA exhaust systems have a reputation for fitting better and making more power than anyother system available. The new exhaust systems for Jeep Wranglers feature a low profile design for maxium ground clearance and have a nice mellow sound. They feature stainless steel construction and high quality hardware for lasting performance.

Editor's Report, "the easiest exhaust system we have ever installed. The pieces fit perfectly and everything was done in a little more than 10 mins." - 10/03

These exhaust systems are matched to work in conjunction with JBA headers for maximum gains. Bolt on a great sounding JBA system for your Jeep and you will feel and hear the difference.

::Exhaust Features::
  • Smooth mellow sound without annoying interior resonance
  • High flowing mandrel-bent tubing
  • Low profile design for maximum clearance
  • Heavy-duty stainless steel construction
  • High flow JBA muffler
  • Polished stainless steel chrome plated exhaust tip with JBA logo
  • Easy bolt-on installation
  • High quality hardware
  • O.E. style exhaust hangers

::How does it sound?::

2004 Jeep Wrangler 4.0L
JBA Headers p/n 1527SJS and JBA Exhaust System p/n 40-1501
idle and rev (MP3) Coming Soon
accelerating (MP3) Coming Soon

::Jeep Exhaust Systems::



07-16 Wrangler, 3.6/5.8L, 4 WD, 2 1/2" single rear exit


00-06 Wrangler, 2.5/4.0L, 4 WD, 2 1/2" single rear exit


91-96 Wrangler, 2.5/4.0L, 4 WD, 2 1/2" single rear exit


97-99 Wrangler, 2.5/4.0L, 4 WD, 2 1/2" single rear exit


For more exhaust system applications Click here

::Dealer locator::
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