Underdrive pulleys, synthetic fluids, electric fan, supercharger...
Proper air pressure, alignment.
If you had an older model I would suggest basic tune-up parts and a fresh O2
sensor.
> Hey all ok here's the dilemma i need advice i have an '03 sxt 3.9 manny
tran.
> an I want to find engine mods that will not only give me more hp but better
> mpg any thoughts on where to start would be greatly appreciated ..the only
> mod done so far is i took off the factory air intake an swapped in a 10"
> round k&n filter..thanks ..Jake
>
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