It is gonna be a 96-98 GT, so it wouldn't be coming with the PI heads, aren't all 4.6 and 5.4 PI heads the same? I want to go NA, since it'll be my daily driver, my only concern about 4:10's is the highway, will the top speed drop with 4:10's
P.S. is there a way to change my sn, I'll want a...