I have a stock 2003 V6 Mustang auto. I am not looking to put alot of money into the car, as it is a V6 auto

but i would like it to have better acceleration. im not too concerned about top end speed. The mods im looking at are a CAI, throttle body spacer?, full dual or cat back dual exhaust depending on budget, underdrive pulley and a chip reprogrammer/tuner, 4.10 gears may be in the future. Any help or advice on these parts and what order i should install them would be greatly appreciated, thanks!
