I would just suggest to get Gears, save up for them.

 

yeah gears...just look at how much they helped out 02mustangv6dd..........actually the intake spacer seems to be the best for the money as far as your other choices....i have an ebay cai and its crap....pullies are for high range just like razz said and low end is better for when your just driving around

 

i had thought about the intake spacers, but i'm looking for mods that will help increase my gas mileage.

 

They say they do increase MPG tho