Unleash the full potential of your Audi RS4 B9 or RS5 F5 with the CRT Performance Catless Downpipe, engineered specifically for the EA839 DECD / DECAJ engine platform. Designed for European OPF/GPF-equipped models, this downpipe delivers dramatically improved exhaust flow, reduced backpressure, and a sharper, more aggressive exhaust note.

Key Features

• Reduced Backpressure – Enhances turbo spool, throttle response, and overall performance.

• Weight Savings – Significantly lighter than the restrictive OEM catalytic setup.

• Optimized Flow – Smooth, mandrel-bent tubing eliminates turbulence for efficient exhaust gas velocity.

• Aggressive Exhaust Tone – Deep, motorsport-inspired sound without unwanted drone.

• Thermal Protection – Wrapped with a premium high-temperature heat shield for maximum safety and efficiency.

Materials & Construction

• Handcrafted from 304-Grade Stainless Steel – Corrosion-resistant and built to withstand extreme heat.

• Precision CNC-Machined Flanges – Ensures perfect OEM fitment and leak-free connection.

• TIG-Welded for Strength – Professional motorsport-grade craftsmanship.

• Thermally Insulated Exterior – Reduces engine bay temperatures and protects adjacent components.

Testing & Durability

Every CRT Performance Downpipe is track and road tested under high-stress conditions to guarantee exceptional durability, fitment precision, and consistent performance.

Important Notice

• This downpipe replaces the factory catalytic converters.

• Check Engine Light (CEL) may occur depending on the vehicle’s ECU calibration.

• CRT cannot guarantee emissions compliance – for off-road or motorsport use only.

• Designed exclusively for EU models equipped with OPF/GPF filters.

Compatibility

• Audi RS4 B9 (2019–2024, EU)

• Audi RS5 F5 (2019–2024, EU)

For OPF/GPF-equipped vehicles only.