I did some roll ons against the ZX 14 with my 05 busa and I've driven it and it is faster,both bikes have a muzzy pipe,pc3,stock gearing.We went from 2nd gear 5500 rpm,anything less and the busa jumps out a bike or two,we stayed together through 2nd,shifted 3rd and the ZX 14 started to creep away and got worse as we shifted into 4th shut down at the top of 4th but the 14 would have kept pulling.I wanted to go on the highway 2nd to 6th but we didn't get a chance,next time we will and I'll give you the low down,but all I can say is the 14 is faster has more neutral steering at low speeds and better brakes and is much smoother trans and motor(dual counter balanced),the busa has more low end grunt,handles better at speed and is way better looking and more comfortable for a passenger(that came from two chicks who rode them back to back)pretty much what the mags say,170 hp against 184 hp both having pipes,do the math,the 14 has to be faster.