i thought full exhaust helped out with long tube headers.

 

i would have to say to do some suspension work. i paid $700 for my springs, shocks, struts, upper and lower control arms, and installed it myself.it makes a huge difference and makes the car alot more fun to drive. so far that hashad the most bang for my buck. next forme is gears, so i will let you all know what i think about them when i get them installed.

 

shifter they are great

 

Changing your ring and pinion will not make that big of difference on your gas mileage!!!!! The only way you will see a noticable decrease (more than 1mpg) is if you get and 4.10 or lower ratio and cruise at 100 mph down the interstate.

Mods that will make a noticable difference on your car: (other than a gear)

PI swap
Nitrous
F/I

Dont waste your money on anything else.