Turbosmart 97-06 Audi A4 1.8T 20V / 99-03 Audi S3 1.8T 20V Kompact Plumb Back Diverter Valve (25mm)

The Turbosmart Kompact Plumb Back Diverter Valve is a full recirculating blow-off valve designed for enhanced performance and reliability in turbocharged applications. Featuring a plumb back system, it recirculates all excess pressure back into the intake system, reducing compressor surge and maintaining smooth throttle response. Constructed with high-quality materials, this BOV offers durability and consistent operation, making it an ideal upgrade for enthusiasts seeking a discreet yet effective boost control solution. Its compact 25mm size ensures compatibility with a range of turbo setups, providing a reliable and quiet operation while delivering the performance benefits of a premium diverter valve.

This diverter valve is specifically engineered for 1997–2006 Audi A4 1.8T 20V and 1999–2003 Audi S3 1.8T 20V models equipped with the specified engine configurations. It is a direct bolt-on replacement that integrates seamlessly into the factory intake system, suitable for street and daily driving applications where discretion and performance are priorities. The kit includes the valve itself, with no additional components required for installation. Designed for enthusiasts who prefer a non-visible, recirculating BOV, this product enhances boost stability and engine reliability without drawing unwanted attention, making it an excellent choice for both stock and modified turbocharged vehicles.