2006FXDCI
Active Member
I talked to my builder today he said my 107" is making 107 hp and 117 tq. He said that the volumetric efficiency is dropping off bad around 3500 rpms and that i definetly need to go to a 2 into 1 exhaust, he recomends the d&d fat cat. Any one running one? What other pipes have you had good luck with