i need to do some stuff to my mustang its a 01 v6 hard top automatic, i would like to modifi some of my car right now i have true duel cat back exhaust flowmaster 40's and a cool air intake... what else could i do i would like it to be naturally assperated no turbo

 

from what ive read on here you can do the underdrive pulley setup, aluminum driveshaft, tuner, maybe put a windstar upper intake.

 

rear gears and a tuner would open up your auto quite a bit