Exhausts
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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.
Headers

Borla produces a premium T-304 aircraft grade stainless steel header system to replace restrictive factory cast-iron exhaust manifolds with full-length head pipes.
1.500" primary pipes, 2.250" collector, and 2.250" headpipe.

Borla

Doug Thorley Headers specialize in a complete line of performance tested, smog-legal headers. These "shorty" style headers are made of heavy 14 gauge nickle-chrome plated steel with mandrel-bent tubing. Thick 3/8 inch flanges and welded O-rings ensure leak free usage under extreme conditions, even on vehicles with catalytic converters. Thorley uses a tri-y design that produces monstrous torque gains.
1.625" primary pipes and 2.500" collector.
Lifetime Warranty!

Doug Thorley

Gibson also produce shorty smog-legal, heavy duty headers in both stainless steel and nickel chrome plating.
Thick 3/8 inch Header Flange.
Comes With All New Hardware And Gaskets.
Includes Any And All Required Emissions Fittings.
Excellent Clearance For Both Lowered And Lifted Vehicles.
Limited Lifetime Warranty.

Gibson Exhaust

Clifford Performance Header - Dual Outlet Headers w/smog & FI Fittings. This is the best replacement Header for adding Power and Torque gains to your Inline Six. Made of the best quality 16 guage steel, 1-1/2" tubes, 2 1/2" collectors & 3/8" flange.

Clifford Performance

Banks Power Torque Tube Exhaust Manifold Assembly.
1991-03 WRANGLER, 1991-01 CHEROKEE, '93-01 GRAND CHEROKEE, 1991-92 COMMANCHE: Banks TorqueTube is a streamlined exhaust manifold designed to optimize exhaust flow and engine efficiency. Because the stock manifold's flange does not align squarely with the ports, flow is restricted. TorqueTube corrects the problem with a half-inch flange that is machined dead flat, and precisely fitted to the port pattern. You can hear the difference in the plusher, healthier exhaust note.
Unlike the stock, failure-prone intake manifold, Banks TorqueTube is built of heavy, 409 stainless steel to weather a lifetime of heat, stress and abuse. The flange, fully welded to the tube assembly on both sides, will never crack or separate. The gasket is made of SMI 900, a material that stands up to super-hot temperatures.
Bolts right on. Optional head pipe available for the best flow.

Banks Power
High-flow cats

Car Sound Direct-Fit and Universal Catalytic Converters are designed for durability and performance. Car Sound converters feature ribbed bodys, 1/2 inch lap-joints (where the neck meets the body), heavy guage stainless steel, and seam welds along the case; all for extra strength. Internally Car Sound uses a high flow monolithic honeycomb catalyst. The ceramic is designed for maximum flow and surface area. The coating method is controlled to maintain exact specifications. An improper coating could result in flow restrictons or an emission test failure. The end result is a heavy duty, street legal converter with the highest flow possible. Don't forget it is not legal to replace a catalytic converter until it has reached 5 years or 50,000 miles, or if it has failed.

Carsound

Random Technology Super High Flow catalytic converters. (Direct-fit, bolt-in Super High Flow converters are available for most vehicles. Check the application charts for specific part numbers.)

Random Technology
Cat-back systems

BORLA Aircraft Quality T304 Stainless Steel Cat-Back Exhaust Systems With Polished Stainless Tip(s)
Rear Exit Cat-Back System With Square Angle Cut Intercooled Tip
Borla Performance Industries catalytic converter back T-304 stainless steel systems are made for race, street, and off-road. Systems include a full welded case high-flow muffler, mandrel bent tubing, and polished stainless steel tip(s).

Borla

GIBSON Cat-Back Stainless and Aluminized Exhaust Systems for Most Domestic and Some Import Model Trucks and SUV's. A Variety of exit locations.
Single 2 1/2inch Aluminized Steel Cat Back Exhaust System
Larger tubing and a high-flow muffler allow your engine to breathe easier creating an increase in power as well as mileage! Limited Lifetime Warranty.

Gibson Exhaust

Rusty's Exhaust Systems

Get the most out of your engine with an exhaust system from Rusty's. All kits will increase the horsepower and give you that performance tone you like. All-aluminized materials give them a longer lasting, sharper appearance. Using mandrel bending the flow area remains consistent, increasing flow 35% compared to stock. The kits come with all hardware and is a bolt on.

Rusty's Offroad

Turbo City Rock-It Exhaust Systems.

All systems larger diameter tubing, Aluminized mandrel bent. System is styled after factory exhaust with the outlet curved down to help deflect the noise. System produces a Pleasant, Deeper exhaust note -- not rumbly. Used factory style hangers. Systems to fit TJ, YJ, XJ & Grand Cherokee with 4.0 & 2.5 engines.

Turbo City
High-flow mufflers

"FLOWMASTER MUFFLERS and exhaust systems deliver unequaled performance no matter what you drive"

Flowmaster

DYNOMAX offers the widest selection of performance mufflers on the market. With a muffler for every performance application, Dynomax has it all: sound, performance and durability.

Dynomax

MAGNAFLOW universal fit mufflers
Options galore! Aluminized or stainless, singles or duals, oval or round, with or without tips. The one stop for all the mufflers, tips and converters you need.

Magnaflow