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.

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™ & 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.

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.

Features:

• • 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

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.