I'm going to be honest with you ....I'm not 100% sure you would even feel the difference ..these engines have been so carefully designed that you would better off going with a really good performance exhaust
system air cleaner combo but as far as porting . I'm not to sure ? Yes a factory race bike set up on a chassis dyno .. you might get
some torque curve
changes but a lap-top and some tuning and fuel adjustments will net you more performance ..than letting some local idiot with a die grinder Hog out your intake and heads then telling you you're ready to take on F1 championship... DON'T BY IT... He's dreaming and hasn't been on the planet long enough to jerk himself off yet...DON'T LET ANY IDIOT WANNABE MESS WITH YOUR BIKE.. Save your cash and if you live long enough step up to an older STOCK GSXR 1000 then have some real fun...