just installed mac throttle body on 02 screw 5.4. mac stated on a email that it the 75mm throttle body would give me 5-8hp and i wasnt sure if it would be worth the money but i must amit before i installed it i couldnt power brake in my driveway and now i diffently can also no hest a wot still need to test it some more the only other mods are mac catback and k@n cold air cant waite to get some more goodies (elec fans mirco tuner so on so on) dose anybody now how to port and polish the elboe that the tb connects to thanks 72 mustang