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I'm running the single disc Ram on my 600hp 482" cobra and it's been fine. Smooth engagement and no slip. I'm running drag radials too and really put the power down.

My 640hp C6 Z06 uses Mcleod's RXT dual disc. It's rated to 1000hp and doesn't slip although it tends to have some engagement chatter. The chatter is sort of common and has been reported by many. Had I an opportunity to do it over again I'd probably have selected a different clutch.