fastest (top speed) or quickest (acceleration)? the fastest would probably have to be the quadzilla with a top speed of nearly 90 mph stock, i believe correct me if im wrong though, and the quickest i would have to say would probably be the raptor 700.
'07 450ER:
white brothers xc bumper, prm swinger skid, jetted, baffle removed
'98 Yamaha Blaster:
Airsal firebreather 240 kit, Vitos 3mm stroker crank, Project blaster aluminum airbox, Project blaster intake, Keihin 35mm airstriker carb, Vitos timing degree key, Boyeson pro series reeds, F7 pipe and silencer, Uni air filter, Durablue +2 axle (stock now i broke it), Kenda Klaw rear tires, Douglas .190 rear wheels (now stock i bent them), oil injection block off kit, EBC heavy duty clutch kit, 13/38 gearing, billet clutch basket, lightened flywheel, Renthal works chain, Fly handlebars, Hellbound +3 swinger, nissin hydro brake kit, banshee front shocks (stock now i bent them) , works quadstar rear shock w/rezzie, DG National front bumper
coming soon:
Maier race cut fenders
Elka/Leager a arm and shock kit
DG national series grab bar