Audi A4 1.8T 2004-05 with K03 or K04 turbo

Highlights of the APR R1 Diverter Valve Include: Diaphragm-Based Valve High-Temperature, Nomex-Reinforced Material for Extreme Durability Zero-Friction No Sticky O-Rings to Maintain and Grease No Pistons to get Stuck Consistent Performance Year...

If your turbo isn't acting right and you're not seeing the full boost you expect, consider replacing your N75 valve. It controls the boost signal to the turbo's wastegate and makes sure you're getting the power you're supposed to!