I have 10" samsons in mine, and they just takes the high edge off, but not much more. Look at the ones from khromwerks, too. More money, but very low restriction.
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...