Only difference I know of is the soft rev limiter.
SP1:PVM mag.,full Akra,Durbahn airbox,T1 G2 snorkel,SpeedCell,SP2 swing+mod. subfr.+engine cover,WP susp. +TiN,endur. fairing VFR400 headlight,KYA fronts, Setrab oilcooler,MR clipons,flowed throttlebod.,lightened flywheel, Moriwaki rests, Delrin stacks,BKG triple clamps,PC II,Ti bolts, qr seat+tank,Durbahn/ISR rear brake,Durbahn CCC,AFAM 15-41, DID520,CBR600RR coils,50310 fan switch,mod. wire harness,HRC overflow,Extreme Graphics undertray,Harris fairing stay.