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SKU: S5520409 / UPC: 882963111067
MBRP Cat-Back Exhaust System for 2004-2006 Jeep Wrangler TJ Unlimited 4.0L I6
Outfit your 2004-2006 Jeep Wrangler TJ Unlimited's exhaust with the MBRP S5520409 cat-back system, engineered for direct bolt-on installation that unlocks noticeable gains in horsepower and torque while delivering a deep, aggressive exhaust note perfect for off-road adventures and daily drives. This single-exit setup routes 2.5-inch mandrel-bent tubing from the catalytic converter back, paired with a high-flow Race Profile muffler that reduces backpressure, lowers exhaust temperatures, and enhances overall engine efficiency for better throttle response and fuel economy compared to stock configurations. Built from durable T409 stainless steel, it withstands harsh conditions like salt, mud, and rough terrain without compromising flow or sound quality, making it the reliable pick for Wrangler owners seeking proven dyno-tested improvements without the hassle of custom fabrication.
Precise Vehicle Fitment
- Years: 2004-2006
- Make: Jeep
- Model: Wrangler TJ Unlimited (LJ)
- Engine: 4.0L Inline-6 (I6) – confirmed compatibility with Rubicon, SE, Sport, Sahara, X, 65th Anniversary Edition, and Unlimited variants
Notes: Utilizes factory hanger locations for a seamless fit; verify clearance for aftermarket fuel tank skid plates, as some may require minor adjustments
Complete Kit Contents
This all-in-one exhaust kit includes everything needed for a straightforward installation:
- Race Profile high-flow muffler
- 2.5-inch turndown tailpipe (single rear exit, no separate tip required)
- 2.5-inch band clamp
- Muffler flange fasteners and hardware
- Additional exhaust hanger with fasteners
- Comprehensive installation instructions
Key Specifications
- Material: T409 stainless steel construction for rust resistance and easy maintenance
- Pipe Diameter: 2.5 inches (mandrel-bent for smooth flow)
- Exit Style: Single rear turndown
- Part Number: S5520409
- UPC: 882963111067
- Product Weight: 23 lbs
- Shipping Box Dimensions: 37 inches L x 11.65 inches W x 6.65 inches H (compact packaging for cost-effective delivery)
- EPA Compliance: 50-state legal, meets emissions standards
Easy Installation and Long-Term Support
Bolt this system on using basic hand tools in under two hours – start by removing the stock muffler and tailpipe, secure the new muffler to the existing flange at 45 lb-ft torque, align the tailpipe with the clamp, and mount the hanger to the frame hole above it. Welded hangers ensure vibration-free alignment, and the design avoids welding or cutting for a reversible upgrade. Backed by a lifetime warranty against material and workmanship defects for the original owner (excludes surface rust, abuse, or improper install), it's crafted in North America to handle real-world demands.
For 2004-2006 Jeep Wrangler TJ Unlimited owners upgrading from factory exhaust, the MBRP S5520409 stands out with its balance of power gains, rugged build, and hassle-free setup.
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2006 | Jeep | Wrangler | Unlimited |
| 2005-2006 | Jeep | Wrangler | Unlimited Rubicon |
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