TGK Motorsport Audi EA824 V8 4.0T Blow-Off Valve Conversion Kit replaces the factory electronic diverter valves with a high-performance mechanical blow-off valve system. Designed for Audi’s 4.0T twin-turbo V8 platform, this kit improves boost reliability, enhances turbo response, and eliminates common diverter valve failures while delivering the classic blow-off valve sound. Engineered for Audi models including the C7 S6, S7, RS7 & RS6.