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SKU: S5520AL / UPC: 882963111074
MBRP Cat-Back Exhaust System for 2004-2006 Jeep Wrangler TJ Unlimited 4.0L I-6
Transform your 2004-2006 Jeep Wrangler TJ Unlimited with the MBRP S5520AL 2.5-inch cat-back exhaust system, engineered for drivers seeking noticeable gains in power, torque, and sound from their 4.0L inline-six engine. This single-side, turndown exit setup replaces the factory exhaust after the catalytic converter, delivering a deep, aggressive tone that echoes like a track-ready machine while channeling exhaust flow for real-world improvements in throttle response and pulling strength.
Built from 16-gauge heavy-duty aluminized steel, it resists corrosion and withstands road debris, ensuring lasting performance in dry conditions without the higher cost of premium materials.
Compared to stock systems or other aftermarket options, the S5520AL stands out by providing up to 18 horsepower and 28 ft/lbs of torque, plus 1-2 mpg better fuel economy, all while maintaining direct bolt-on compatibility that simplifies the upgrade process.
Drivers choose this system for its balance of aggressive exhaust note, measurable engine efficiency, and straightforward setup that gets you back on the trail faster.
Vehicle Fitment
- Years: 2004-2006
- Make: Jeep
- Model: Wrangler Unlimited (TJ), including Rubicon variants
- Engine: 4.0L I-6 (gasoline only)
Notes: Fits 2-door Unlimited models, direct replacement after catalytic converter, no modifications to engine or cab required.
What's Included in the Purchase
This complete cat-back kit arrives in one box with everything needed for installation:
- 2.5-inch mandrel-bent aluminized steel tubing (race profile design for smooth flow)
- Single straight-through muffler for reduced backpressure
- Turndown exit tailpipe (single rear exit configuration)
- 3.5-inch diameter tip (1 included)
- Factory-style hangers and brackets for direct fit
- Stainless steel clamps and hardware
- Installation instructions (no additional parts required)
Key Specifications
- Part Number: S5520AL
- UPC: 882963111074
- Material: 16-gauge aluminized steel
- Pipe Diameter: 2.5 inches
- Exit Style: Single rear, turndown
- Muffler Type: Straight-through (1 included)
- Tip Quantity: 1 (3.5-inch outlet)
- Cutting Required: Yes (minor adjustments possible for perfect alignment)
- Warranty: 3-year limited
- Country of Origin: North America-made for quality control.
Installation Details
Bolt this system on using basic hand tools in about 1-2 hours. It connects directly to factory hangers post-catalytic converter, with mandrel bends ensuring no restrictions in flow. Professional installation recommended if you're new to exhaust work, but the included hardware makes it accessible for weekend mechanics.
Shipping Information
- Part Weight: 28 lbs
- Shipping Box Dimensions: 42 in. L x 17 in. W x 8 in. H
Equip your Jeep Wrangler TJ Unlimited with the MBRP S5520AL today for a exhaust upgrade that amplifies every drive with added muscle and a signature rumble that turns heads on and off the road.
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2006 | Jeep | Wrangler | Unlimited |
| 2005-2006 | Jeep | Wrangler | Unlimited Rubicon |
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