I don't get it. You sure your ZX-10 buddy's bike is stock? My best friend and track day partner also rides a ZX-10. Stock for stock, I could get him in the straights. It got worse as the speed increased. Are you shifting at 10 grand?
Hell, almost nobody leaves their sportbike stock.....and if you can't see the mods they sure aint gonna admit it
My bikes has Viper race cans on it....and thats all I'm gonna admit to unless you prove otherwise
I know a guy that has a 10 he stripped all the id off of....most folks think its a 6R....and he lets them think it all the way up to the major spanking lol. Plus he's got some sweet internal mods, dontcha' hate those sleepers ?
Just because somebody says their bikes stock don't assume it is. Its hard to tell if a bikes been geared down/cammed/bored ect till its pulling away....