It takes about 5 minutes to open the intake manifold up to fit a 90MM throttle body, been there done that. It made it much more responsive to throttle input, WOT power didn't seem much if any improvement but part throttle is very much improved with a bigger throttle body. Probably want to get a bored factory throttle body as the electronics in the cheap chinese ones are not good, I am just about ready to make a post to report my findings on them.