I put a set of hooker chambers on and rejet,dyno it , and polish the ports,to spects with a mini die grider, wesco high comp heads, and i was pullin 125.7 hp snap,! snap!,snap! was more like the sound, a modified 900 Z1, still was no match then for me ,and the monster I created,its a wonder,? I"m still alive, but i learn to respect the monster i created,then,mind was blue and i donĀ“t remenber rootbeer colors,The rear tire was not wide enought,spocket changes to a different ratios ,was a real spine banger also,i was was never beat ,by any thing on the street.the expansion chambers made the manchine breath soooo smooth.