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  • APR 18-25 Audi S4/S5 (B9) Catback Exhaust System
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APR 18-25 Audi S4/S5 (B9) Catback Exhaust System

APR
APRCBK0012
Catback
$2,419.60 $1,828.44
$1,828.44
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APR 18-25 Audi S4/S5 (B9) Catback Exhaust System
Description

The APR Catback Exhaust System for the Audi B9 S4 and S5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. Inspired by the larger center-pipe design of the higher-output RS4 and RS5 models, this system is engineered to boost performance, elevate sound, and enhance aesthetics with customizable exhaust tips that are sure to make a statement. Crafted from premium materials and built with advanced manufacturing techniques, this system is designed to withstand harsh conditions and deliver lasting performance. Expect a bold, aggressive growl at wide-open throttle, along with an impressive gain of 10 horsepower and 12 FT-LBS of torque to all four wheels!

  • Smooth transitions and straight-through components maximize performance by reducing restrictions.
  • Removable quad 3.5” motorsport-style polished tips with APR logo; optional styles available.
  • Complete catalyst-back system including downpipes, extending from the factory catalyst back.
  • Mandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.
  • Precision brackets and slip clamps ensure accurate alignment and hassle-free installation.
  • Premium T304 stainless steel construction with TIG welding for strength and durability.
  • Optimized flow through dual 2.5” downpipes, 2.75” midpipes, and a 3.5” midpipe.
  • Strikes the perfect balance of power, sound, style, and quality for enthusiasts.
  • Performance gains of 10 HP and 12 FT-LBS of torque delivered to all four wheels.
  • Valve-controlled rear mufflers dynamically adjust sound based on driving style.
  • Integrated Helmholtz resonator minimizes drone and enhances sound quality.
  • Includes an upgraded tunnel brace to accommodate the larger piping.
  • Fully emissions compliant for worry-free operation.

This Part Fits:

Year Make Model Submodel
2019-2025 Audi S4 Premium
2018-2025 Audi S4 Premium Plus
2018-2025 Audi S4 Prestige
2019-2024 Audi S5 Premium
2018-2024 Audi S5 Premium Plus
2018-2024 Audi S5 Prestige
2020-2025 Audi S5 Sportback Premium
2018-2025 Audi S5 Sportback Premium Plus
2018-2025 Audi S5 Sportback Prestige
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