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This Part Fits:
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2018 | Audi | S4 | ||
| 2019 | Audi | S4 | ||
| 2020 | Audi | S4 | ||
| 2021 | Audi | S4 | ||
| 2022 | Audi | S4 | ||
| 2023 | Audi | S4 | ||
| 2024 | Audi | S4 | ||
| 2025 | Audi | S4 | ||
| 2018 | Audi | S5 | ||
| 2019 | Audi | S5 | ||
| 2020 | Audi | S5 | ||
| 2021 | Audi | S5 | ||
| 2022 | Audi | S5 | ||
| 2023 | Audi | S5 | ||
| 2024 | Audi | S5 | ||
| 2018 | Audi | S5 Sportback | ||
| 2019 | Audi | S5 Sportback | ||
| 2020 | Audi | S5 Sportback | ||
| 2021 | Audi | S5 Sportback | ||
| 2022 | Audi | S5 Sportback | ||
| 2023 | Audi | S5 Sportback | ||
| 2024 | Audi | S5 Sportback | ||
| 2025 | Audi | S5 Sportback |
Specifications:
| Brackets | Precise |
| Brand | APR |
| Category | Exhaust |
| Clamping Type | Slip Clamp |
| 1882 | Yes |
| Emission Code | 5 |
| 11205 | Polished |
| 1162 | 3.5 |
| 1163 | Carbon Fiber with Brushed Inlay |
| 1161 | 4 |
| 200 | Brushed |
| 9871 | 2.75 |
| 9871 | 2.50 |
| 9871 | 3.50 |
| 9882 | Brushed |
| 1174 | Sound Absorption |
| 1174 | Helmholtz |
| Pipe Material | T304 Stainless Steel |
| Product Type | Exhausts (Catback Systems) |
| Sub Category | Exhaust and Tail Pipes |
| 4369 | 2.5 |
| Tube Connection | Butt Joint |
| 6014 | Yes |
| 2126 | OEM |
| Warning | California Proposition 65 |
| Welding | TIG |
| Pipe Bend Type | Mandrel |
| Exhaust Tip Removable | Yes |
| Description_SHO | Exhaust |
| Description_INV | CATBACK, B9 S4 SEDAN |
| Description_DES | APR Catback Exhaust System - S4 / S5 (B9) |
| Description_EXT | Fits Audi S4 18-25, S5 18-25 |
| Description_MKT | Introducing the APR Catback Exhaust System for the Audi B9 S4 and S5 |
| Description_MKT | 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! |
| Description_MKT | Unmatched Design and Precision Engineering |
| Description_MKT | Unlike anything currently available, the APR system includes downpipes extending to the factory catalyst in the upper engine bay, making this a true full-system upgrade. We’ve minimized restrictions with smooth transitions, oversized piping, and straight-through mufflers and resonators. Constructed from mandrel-bent T304 stainless steel with a brushed finish and TIG welding throughout, this exhaust system is as durable as it is striking. Installation is hassle-free, thanks to precision-fit brackets, OEM-style slip clamps, and an included upgraded tunnel brace to accommodate the oversized piping. |
| Description_MKT | Inspired by RS Performance |
| Description_MKT | Like the RS4 and RS5, this system features a reengineered exhaust routing design. It utilizes dual 2.5” (63.5mm) downpipes to dual 2.75” (70mm) midpipes pipes merging through a cast Y-junction into a massive 3.5” (91mm) midpipe, replacing the restrictive factory dual-pipe setup. The integrated Helmholtz resonator minimizes drone through a straight-through design with a sound-canceling port, ensuring no compromise in exhaust flow. |
| Description_MKT | The system splits again via another cast Y into two rear, valve-controlled mufflers with sound absorption technology. These valves are fully integrated with the OEM control system, adjusting automatically to enhance sound during aggressive driving while maintaining a quieter profile during cruising. Finally, exhaust gases exit through dual cast Y-junctions into a quad 2.5” (63.5mm) system, terminating in 3.5” (91mm) lightweight, single-walled motorsport-style tips. The tips feature a polished stainless steel finish and a subtle APR logo for a refined touch. |
| Description_MKT | Experience the APR Difference |
| Description_MKT | Designed for enthusiasts seeking the perfect balance of power, sound, style, and quality, the APR Catback Exhaust System for the Audi B9 S4 and S5 is a testament to engineering excellence. With its performance-driven design and durable construction, this system not only transforms your driving experience but also ensures years of reliable performance. |
| Description_FAB | Complete catalyst-back system including downpipes, extending from the factory catalyst back. |
| Description_FAB | Performance gains of 10 HP and 12 FT-LBS of torque delivered to all four wheels. |
| Description_FAB | Premium T304 stainless steel construction with TIG welding for strength and durability. |
| Description_FAB | Optimized flow through dual 2.5” downpipes, 2.75” midpipes, and a 3.5” midpipe. |
| Description_FAB | Mandrel-bent brushed piping paired with electropolished cast splitters for a refined finish. |
| Description_FAB | Precision brackets and slip clamps ensure accurate alignment and hassle-free installation. |
| Description_FAB | Includes an upgraded tunnel brace to accommodate the larger piping. |
| Description_FAB | Integrated Helmholtz resonator minimizes drone and enhances sound quality. |
| Description_FAB | Valve-controlled rear mufflers dynamically adjust sound based on driving style. |
| Description_FAB | Removable quad 3.5” motorsport-style polished tips with APR logo; optional styles available. |
| Description_FAB | Smooth transitions and straight-through components maximize performance by reducing restrictions. |
| Description_FAB | Strikes the perfect balance of power, sound, style, and quality for enthusiasts. |
| Description_FAB | Fully emissions compliant for worry-free operation. |
