Re: 954 engine modifications
I'm not exactly sure about the butterflies. I want to say it was the secondary butterfiles, but I could be mistaken. A guy I ride with from time to time said he made some kind of modification to the secondaries and saw a slight gain in power. His GSXR hauls a$$. I'm no machanic by any means, but I want to get in to this more.
The TRE is a timing retarder that plugs into the bikes computer. The guy I ride with has a TRE on his GSXR 1000. It also bypasses the 186 restriction. He hit redline on his 1000 in sixth. I think the ARE is an advanced timing retarder. I think it allows you to make timing adjustments. Another guy I ride with has a busa with the ARE. For a bike without a turbo or nitrous, it is stupid fast.
I would consider a cam change.