On the track bike:
GSXR-600 shock
Gold valve emulators
stiffer fork springs
Muzzy header
light weight battery
removed head light
removed fan
removed side and center stands
removed all turn and tail lights
rearsets
17" wheels from NewGen
chain without o-rings
painted to resemble GPZ-900
On the street bike:
GSXR-600 shock
gold valve emulators
cut stock fork springs 2"
rearsets
oh and, quick turn throttle tube on both