MBRP S4802304 Armor Pro 3in Cat-Back Race Exhaust for 2011-21 Subaru WRX/WRX STI

Vehicle Fitment

• 2011-2014 Subaru Impreza WRX Sedan (2.5L Turbocharged H-4, AWD)
• 2011-2014 Subaru Impreza WRX STI Sedan (2.5L Turbocharged H-4, AWD)
• 2015-2021 Subaru WRX (Base, Premium, Limited; 2.0L Turbocharged H-4, AWD)
• 2015-2021 Subaru WRX STI (Base, Premium, Limited, Sport; 2.5L Turbocharged H-4, AWD)

Fitment Notes

• 2011-2014 fitment is restricted to the Sedan body style only - does not fit the 2011-2014 Impreza hatchback due to different exhaust routing and rear bumper configuration
• 2011-2014 Impreza WRX and WRX STI require the 2.5L turbocharged engine; the 2015-2021 WRX requires the 2.0L engine; the 2015-2021 WRX STI requires the 2.5L engine
• Cat-back system includes a muffler - this is not a muffler-delete configuration; a no-muffler variant is available separately
• Primary tubing is 3-inch; the system transitions to 2.5-inch tubing at the rear section per MBRP's confirmed specification for this platform

Features

• Race Profile sound tuning delivers MBRP's most aggressive exhaust note - engineered to maximize volume and boxer engine character under acceleration, with a commanding presence at all RPMs
• Quad rear exit configuration produces a track-inspired four-tip appearance at the rear bumper, dramatically transforming the visual stance of the WRX and STI
• Full cat-back design replaces all factory exhaust from the catalytic converter rearward, providing the maximum flow improvement and sound upgrade available in a bolt-on configuration
• T304 stainless steel construction throughout - MBRP's highest-grade material - resists rust, corrosion, and degradation in extreme cold, snow, and road-salt conditions
• Mandrel-bent 3-inch primary tubing eliminates bend rippling and maximizes exhaust velocity from the cat outlet through the entire system
• Includes an integrated muffler tuned specifically for Race Profile output on the WRX/STI's turbocharged boxer engine
• Dual 3.5-inch OD mirror-polished T304 stainless steel single-wall angle-cut tips deliver a clean, aggressive finished appearance
• Direct bolt-on installation using OEM factory hanger locations - no cutting, welding, or drilling required
• Backed by MBRP's Lifetime Warranty under the Armor Pro series - MBRP's top-tier durability and material grade designation

Specifications

• Part Number: S4802304
• Exhaust Type: Cat-Back
• Series: Armor Pro
• Sound Profile: Race Profile
• Exit Style: Quad Rear Exit
• Muffler: Included (muffler variant)
• Primary Tubing Diameter: 3 inches
• Rear Tubing Diameter: 2.5 inches
• Tip Style: Single Wall, Angle Cut
• Tip Outlet Diameter: Dual 3.5-inch OD
• Tip Material: Mirror-polished T304 Stainless Steel
• Body Material: T304 Stainless Steel
• Drivetrain: AWD (all fitments)
• Fuel Type: Gasoline
• Position: Cat-back (replaces all exhaust from catalytic converter outlet rearward)
• Warranty: Lifetime (Armor Pro)

Included Components

• 1x Cat-back exhaust pipe assembly (T304 stainless steel, mandrel-bent 3-inch primary / 2.5-inch rear tubing)
• 1x Integrated Race Profile muffler
• 2x T304 stainless steel single-wall angle-cut tips (3.5-inch OD, mirror-polished)
• 1x Hardware and installation kit (clamps and mounting hardware)
• 1x MBRP installation instructions

Product Description

The MBRP S4802304 is a 3-inch Armor Pro quad rear exit cat-back exhaust system built for the 2011-2014 Subaru Impreza WRX and WRX STI Sedan and the 2015-2021 Subaru WRX and WRX STI. As a full cat-back system, the S4802304 replaces every component of the factory exhaust from the catalytic converter outlet rearward - including the mid-pipe, resonator section, and muffler - making it the most comprehensive and highest-performing bolt-on exhaust upgrade available for this platform. MBRP's Race Profile tuning gives this system its defining character: an unfiltered, head-turning exhaust note that amplifies the turbocharged boxer engine's signature sound across the entire RPM range, purpose-built for enthusiasts who want maximum sonic impact from their WRX or STI.

The system routes through mandrel-bent 3-inch T304 stainless steel primary tubing - stepping down to 2.5 inches at the rear section - before splitting into the iconic quad rear exit layout with four mirror-polished 3.5-inch single-wall angle-cut tips. The full T304 stainless steel construction represents MBRP's Armor Pro tier, the highest chromium and nickel content of any exhaust-grade material, engineered to withstand the harshest cold-climate and high-salt environments without degradation. Unlike the axle-back S4801304, this cat-back system includes an MBRP-tuned Race Profile muffler that shapes and amplifies the exhaust note throughout the full system length rather than simply uncorking the factory rear section.

Installation is a direct bolt-on process using the factory OEM hanger locations with no cutting, welding, or specialized tools required. As with the axle-back variant, the 2011-2014 fitment is limited strictly to the Sedan body style - the hatchback body is not supported due to differences in exhaust routing and rear bumper geometry. Engine requirements are 2.5L for all 2011-2014 Impreza WRX and WRX STI applications, 2.0L for the 2015-2021 WRX, and 2.5L for the 2015-2021 WRX STI. The S4802304 is covered by MBRP's Lifetime Warranty and is the definitive exhaust upgrade for WRX and STI owners seeking the most aggressive sound profile and maximum flow improvement the platform can support in a complete bolt-on package.