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I've been using the BDL "quiet" clutch systems. so far with a few builds and in the 96-103 inch high performance motors Ive yet to see any issues...they are simple to set up using "springs" either 6 or 9 with shoulder bolts that you simply tighten down till it bottoms..no adjusting or chasing spring dis engagement being equal* two different spring tensions to chose from. I am sold on them completely, and are priced reasonably.