Experience the true performance potential of your Audi RS4 or RS5 with the CRT Performance Catless Downpipe, engineered specifically for the EA839 DECA twin-turbo V6 engine. By removing the restrictive factory catalytic converters, this system dramatically reduces exhaust backpressure — resulting in faster turbo spool, improved throttle response, and a deeper, motorsport-inspired exhaust tone.

Key Features

• Reduced Backpressure – Faster turbo response and improved throttle precision.

• Weight Reduction – Lighter than factory catalytic assemblies, enhancing overall performance.

• Optimized Exhaust Flow – Smooth mandrel bends minimize turbulence and maximize velocity.

• Aggressive Sound Profile – Deep, raw exhaust tone ideal for enthusiasts and track setups.

• Heat-Resistant Design – Wrapped with premium thermal insulation for optimal temperature control.

Materials & Construction

• Handcrafted from 304 Stainless Steel – Exceptional corrosion and heat resistance.

• Precision CNC-Machined Flanges – Perfect fit and leak-free sealing.

• TIG-Welded Joints – Maximum durability and professional finish.

• Thermal Shielding Wrap – Maintains exhaust gas temperatures and protects surrounding components.

Testing & Reliability

Every CRT Performance Downpipe undergoes rigorous road and track testing to ensure unmatched reliability, consistent flow efficiency, and long-term structural integrity — even under extreme heat and load.

Important Notice

• This downpipe replaces the factory catalytic converter.

• Installation of a catless system may trigger a Check Engine Light (CEL) due to emissions system monitoring.

• CRT cannot guarantee compliance with emission standards – this product is intended for off-road or motorsport use only.

• Designed exclusively for vehicles without OPF/GPF filters.

Compatibility

• Audi RS4 B9 (2017–2024)

• Audi RS5 F5 (2017–2024)

For non-OPF/GPF models only.