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Primary clutch springs

I would like to change the primary clutch spring so that the it engages between 2500 & 3000 RPM's. My current spring is yellow/white, which engages around 4500 RPM's. Can someone tell me what the clutch spring options are for a 2007 M8 162" track and at what RPM they engage?
 
I don't know the exact engagement RPM but I tried I bunch of different springs last season and settled for the CPC gold spring. lowers the engagement rpms a couple hundred from the stock yellow white
 
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