The retainer cover - sometimes referred to as the input shaft cover - mates to the front of the transmission inside the bell housing and is where the throw-out bearing sits. The clutch fork then slides the bearing on the snout of this cover, which then applies pressure to the pressure plate diaphragm, engaging the clutch. It is a very important and often overlooked piece.
For high-powered applications EXEDY offers Multi plate clutches. These are designed for hot street action as well as drag, road, and rally racing. All of our multi plate clutches come with a lightweight chromoly steel flywheel, and the famous purple anodized forged aluminum clutch cover.