# APR Audi 18-25 RS5 (B9) Catback Exhaust System

The APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. This system is engineered to boost performance, elevate sound, and enhance aesthetics with RS-style diamond black oval 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 9 horsepower and 15 FT-LBS of torque to all four wheels!

-   Smooth transitions and straight-through components maximize performance by reducing restrictions.
-   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 2.75” downpipes, 3.5” midpipe, and quad 2.5” exits.
-   Strikes the perfect balance of power, sound, style, and quality for enthusiasts.
-   Performance gains of 9 HP and 15 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.
-   Dual 7.25”x5” RS-style diamond black oval tips with APR logo.
-   Fully emissions compliant for worry-free operation.

This Part Fits:

Year

Make

Model

Submodel

2018-2019,2021-2024

Audi

RS5

Base

2019,2021-2025

Audi

RS5 Sportback

Base

## Details

- **Price:** 3860.02 CAD
- **Vendor:** APR
- **Type:** Catback
- **Tags:** ClearanceItem:N, Core:N, CorePrice:0, EPA:N/A, Exhaust- Mufflers & Tips>Catback, fits_2018-2019`Audi`RS5`Base~2021-2024`Audi`RS5`Base~2019`Audi`RS5 Sportback`Base~2021-2025`Audi`RS5 Sportback`Base, LTL:N, MPN:CBK0037, Non-CARB:N, Prop65:N, SpecialOrder:Y, TURN14_ID:1086314

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3860.02 CAD | In stock |

## Images

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/apr-audi-18-25-rs5-b9-catback-exhaust-system)
> Updated: 2026-10-30