i beat 450's all the time drag racing on my shee. even modded 450's. but my bike is ported pushing 60hp. a stock for stock race is a close call, but piped shee will win against a stock 450, for sure....depending on a riders, the stock for stock race would probly be a switch off....meaning they would trade wins....yfz450's are no slouch.
if your talking mx, that 450 will waste that banshee...shees werent built for mx....they pretty much own the dunes tho.
and calcium.....a 392 cub makin 70-80hp...well i have a stock cylinder motor running about 80hp, and its a ton cheaper than a 392 cub. its a 4 mil stroker crank motor...with bigger carbs and in frame pipes......
i think if it was any other 450 like a honda or some sh*t other then a yfz...the banshee would win, a yfz revs up the fastest and is most similar to a 2 stroke