Thanks T,
I hadn't thought about the springs being tuned to the engine, but that makes some sense. I now have another question: Since I have a 2.5 transmission on a 2.2 car, should I match the clutch to the engine? It looks like the 2.2 clutch has a diameter of 200 mm, whereas the 2.5 clutch is 215 mm. Has anyone out there done this?