(Keefer @ Sep. 15 2006,14:41) I guess it changes from bike to bike. My 06 busa is bone stock, with the TRE being the only mod. I notice it is smoother in the lower gears, and more responsive in 6th. I have not had time to test it with hard riding yet, but I plan on getting my buddies GPS and doing a high speed pass or 2 to see what it gets me.
This still does not answer my question whether a TRE and a PC 3 will work together. I have seen several people who have the combination on these boards so I guess they have no real drawbacks.