Too big actually will hurt power. I have a 75mm on mine could feel a loss of power and throttle responce. I will be switching back to a 70mm. My friends car made 1100 hp and used a 75mm tb, xx-trim blower and a igloo intake with 8 primary plus 8 secondary injectors. I just don't understand why people want to use such big throttle bodies for small combos. Anyone need a polished 75mm tb, lol, mine will be for sale very soon.