The Spec 05-09 Audi S4 4.2L RS4 Stage 1 Clutch Kit is a performance upgrade for the Audi S4 4.2L engine. It is designed to provide improved clutch response and increased torque capacity for high performance applications. The kit includes a lightweight aluminum flywheel, a high performance pressure plate, and a heavy-duty organic clutch disc. The kit also includes all necessary hardware and installation instructions. The clutch is designed to provide smooth engagement and improved performance for spirited driving.