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An easy route to more horsepower...

...Is to fit a free-flowing exhaust system. The stock Jeep Cherokee 4.0 exhaust is very restrictive. Much of that restriction is in the crushed stock front exhaust pipe (it necks down from 2.25" to as little as 1.75" in diameter at the bends) and the stock catalytic converter.
The best solution is to replace THE WHOLE EXHAUST SYSTEM with a tubular header/front pipe, high-flow catalytic converter, and a high-flow muffler with tailpipe (cat-back).
The result is a gain of 15-20hp.


Doug Thorley 
This complete tri-y header kit will really wake up the motor on your 4.0L Jeep. Tri-Y (or 4 into 2 into 1) style headers by design will increase the power of your motor across the widest RPM band possible. That is the beauty of the design and that is why they are the best street header available. We have also manufactured this header from T304 stainless steel so that we can offer you the highest quality header on the market, and cracked manifolds will never be an issue for you again. All of this 100% American made, and backed by our lifetime warranty!

Gibson Performance
Every Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engine's ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock crossover pipe. They are well suited for lowered and raised vehicles, street and off-road. 50 State Street legal. Meets EPA and CARB requirements. Will not affect the factory warranty. No welding required. Uses OEM style connections. 3/8" Heavy Duty Laser Cut Port Flanges- No Warping or Leaking. Premium Gaskets and Hardware included. Backed by a Lifetime Limited Warranty.

Clifford Performance 
6=8 Dual Outlet Headers.
16 Gauge Steel, 1-1/2" Tubes, 2.50 Collectors W/ 2.25 Street Hookup Kit and Headers Gasket.
Tuned Headers make the difference between headers and 6=8 HEADERS

Banks Power Revolver Exhaust Header with hardware for 1991-1999 Jeep Wrangler 4.0L, 1991-1998 Cherokee
With more power, quicker acceleration and tougher construction than ever, the new Banks Revolver out muscles any competitive exhaust manifold: period! You'd think that being made from super-durable, mandrel-bent 409 stainless steel tubing and sporting a 1/2 inch thick precision ported and machined flange was enough... but there's more. The header is fortified with a Revolver collector which features Banks' patented Power Pickle exhaust collector technology for maximum power.

High-flow cats

Magnaflow specializes in superior catalytic converter and exhaust technology and each converter is designed to the exact original equipment specifications while keeping the Check Engine Light off.

Borla Cat-back Exhaust systems

Borla Cat-Back™ & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere.

Each system is built from premium T-304 austenitic stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer-controlled CNC manufacturing ensures an accurate fit.

Best of all, BORLA® stands behind every system with a Million-Mile Warranty. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.

Flowmaster Force II Exhaust System

For the person who wants a subtle custom appearance with all the benefits that a Flowmaster cat-back exhaust system provides, S.O.R. (Single Out Rear) systems are the perfect choice. Force II systems deliver a mild interior and exterior tone, and are suited to customers looking for efficiency improvements without a lot of noise. Especially recommended for towing applications and daily-driven vehicles. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.


  • • Mandrel Bent Stainless Tubing
  • • Stock to Mild Exterior Exhaust Tone
  • • Incl Hangers and Hardware For Easy Installation
  • • Connects After the Catalytic Converter
  • • Dyno Tuned for Maximum Performance
  • • 2.25" diameter tubing
Dynomax Performance Exhaust
DynoMax® Super Turbo™ performance mufflers exclusive flow director design channels exhaust flow and eliminates turbulence on most applications. The large internal flow tubes improve exhaust flow and reduce backpressure. Each muffler uses fiberglass matting technology to absorb unwanted interior resonance while maintaining a mellow performance tone. The 'Pure Unadulterated POWER' of DynoMax® Super Turbo™ mufflers are backed by a Limited Lifetime Warranty and exclusive 90-Day Performance & Sound Guarantee™. All Dynomax® Performance Exhaust Systems bolt on for easy installation. Your vehicle's complete exhaust can be quickly and easily customized with an emissions-legal premium performance system from Dynomax®.
Gibson Performance Exhaust System Kit

Because Jeep enthusiasts need power from idle to 3000 RPM, Gibson designed their jeep exhaust to enhance low and mid range power for climbing and towing. This single exhaust exits straight out the back, Complemented with polished Stainless Tip. Hassle free, bolt-on installation with professional looking results. Backed by a Lifetime Limited Warranty.
Banks Power Monster Exhaust System

2.5-inch Single Exit, Turndown Tip for 1987-2001 Jeep Cherokee 4.0L, XJ
Huge 2.5-inch stainless mandrel-bent tailpipe with Straight-thru Monster muffler. Flows up to 108 Percent better than stock. No tip included.