I have an 03 and the first clutch mod I tried was adding heavy duty springs...After taking it to the track, I could barely break 9s because of the sudden disengagement while slipping the clutch...I then added an MRE one piece billet hub and their heavy duty springs and went back to the track...On launch it started chattering like a son of a gun...It was almost like I would spin then hookup, spin then hook up...
I pulled the hub and heavy duty springs out and went back to stock and the bike has been as smooth as silk...
Perhaps I needed the cushion mod as well but the springs and one piece billet hub ran like shit...
Right now, I sticking with the 03 stock setup...
BTY, if someone wants an MRE one piece hub and heavy duty springs, I could ship them to you for a "C" note...I paid 2 "C" notes for them and they only have about 15 miles of runtime, one test run after installing the parts and 4 passes at the track...