installed mine a couple weeks ago...I cant tell u how much HP...But ull definately feel it ... It sounds awesome...Especially when its open... I [email protected]*t my pants the first time i ifloored it...And if u dont have the E-cutout, Get one...Its a PITA removing those bolts manually. I KNOW ULL LUV IT... Take care and ENJOY:thumbsup:89ezgo said:yeah i have all thats in the tool box at the shop..so thanks cant wate to put it on and about how much hp will i get out of it???