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The SC is quiet.
There is an 8# pulley, but it's an aftermarket piece that voids the warranty. Excess heat is a major concern with this pulley size.
LPE is holding the dyno numbers secret for some reason. I think they're waiting for the tuning to be final.
The question has been answered repeatedly. If you want to talk to me, shoot me an e-mail. Don't expect to see a response from me when you throw out a page like this, it may be weeks before I check these threads.