I ran then once last night, didnt change anything except shock ends to short and 27.5 droop using the inside hole. The rear end felt flatter, almost like you could drive the car a big harder overall. I don't think drilling is required on these arms but its worth a shot if you want to mess with it. I think have to go to a slightly softer rear setup as well. I was 32.5 and golds and I think white's would have been better or 30 wt.