ok so a few days ago i got a 2001 mustang gt...i plan on modding this car out pretty extensively. I am VERY unfamiliar with modding cars and i want one big question answered: do i need to flash my cars computer every time i mod out anything on the engine/exhaust?? if so what flasher module should i get?? thanks

 

no you dont but i suggest you pick one up anyways like one from predator so you can tune it to pick up some power and also you could read any error codes that may come up

 

no, just disconnect the negative battery cable after changing something out so the ecu can get adjusted to it.

you only need a tuner if you mess with something needing calibration such as gears or redline or air/fuel ratio..... etc

 

get gears and exhaust...cold air no really worth it...pullies are good but get steedas (non piggy back), any suspension is always good and some sticky tires.