Renthall sprocket carrier, go up 2 teeth on the sprocket to fit the carrier, 45mm cans, choose your own make, personaly I have Titanium Leo Vinci's on mine, but there are plenty to choose from & an F.I.M. chip to sort it all out, as for filters stick to standard or get pipercross replacement filters fo you original ones. A power commander is expensive but if the money is there go for it.
The next mods would be suspension, standard supension, set up right, is good, throwing money at an ohlins or equivelent & a fork internal upgrade is expensive but will give better results in the longrun.
Oh & YELLOW ones are FASTER
Chris
[Edited on 27-12-2005 by chris.p]