hey, sorry if this is in the wrong forum, but i've got a question... i've got a stock 02 si (except for the aem cai) and am about to buy an exhaust for it, i want an apex'i N1. i've been faced with two choices: one with a 60mm inlet and a 90mm outlet, and one with an 80mm inlet and a 115mm outlet. how do i know which one will fit? i searched for the answers but i couldn't find them any help is appreciated. thanks.