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I have a 2007 M8 and I noticed yesterday the inner sheave on the secondary has a pretty impressive crack in it and needs replaced. I'm leaning twards the BDX 10.4 Sheaves and using my helix out of the stock clutch I already have rock rollers and a new spring, its going to cost about $300 if I go this route. I can by a brand new stock clutch for $314. I'm just looking for advice/opinions on which way to go.