At our local 1/8th mile dragstrip (
www.elkcreekdragway.com), which is an IHRA sanctioned track, my 2005 YFZ450 runs consistant 8.60's @ 67mph with an occasional 8.50 pass if I can get a really good 60' time.My mods are a DG slip on muffler, removed airbox lid, Pro-Flow kit with a K&N filter, 13 tooth front sprocket and 168 main jet.
I've raced with four different banshee's at this track and the fastest one ran an 8.20 in the 1/8th mile.He had a wheelie bar, ported cylinders, different heads, aftermarket pipes and silencers, bigger carbs, clamp on air filters and V Force reedcages.The slowest one just had aftermarket pipes and silencers and he couldn't get out of the mid 9 second range.
A Banshee can be made faster than just about anything out there in a straight line dragrace, check out Wicked Motorsports or Trinity Racing.It just depends on how much you can afford to spend.