Its been a while now since i have done any mods. I have a magnapack catback exhaust, and a CAI right now. Looking for midpipe and long tube headers. Anyways i also want to get 3.73 gears in the car. Do i need anything more then just the pinion and gear..... or is that it? Cause you can find those for like 150 bucks... but i know installation is a killer. But i was just asking, if thats all i need... or i need to do special upgrades? Im lost and thanks!