I consulted Ryan at RJM who makes the RJM pedal assembly to obtain his opinion since he's a bit of a "clutch" guru when it comes to the Z. Evidently, he has heard from a number of owners of newer 370s about vibrations felt through the clutch pedal (factory as well as RJM assemblies) when shifting at higher rpms. In these cases, the problem has been traced to the factory clutch, and not the CSC. Changing the disc and pressure plate apparently solved the problem. Unfortunately, it's a costly fix since the clutch is not covered under the powertrain warranty. Anyway, that's the input from Ryan. He recommended going with a Southbend Stage 1 or 2 clutch for daily driving … which is consistent with Joe at Z Speed.
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