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I tried my 09 m8 with slp pipe kit at rabbit ear this weekend with my 68 gr cat weights it ran great but i was only getting 7900- 7950 rpm and would like to get to 8100 in a climb can anyone tell me if you can shimm the sec spring on the stock secondary to gain r's or if anybody has other suggestions please let me know . i would like to stay with the 68gr weight though because they work great othewise