Yea I ordered some last night. And my other mods are bama 93 race tune bbk intake o/r x-pipe with mid muffler m80s and that's it for powertrain wise. Was thinking about and bigger throttle body to but I heard it's not that great unless you have FI.

 

UDP's are ok.
gears are another option.

 

I went with BBK on mine.

 

Yea I know I have 4.10s in the car now. Best mod I've done beside the tuner

 

I did them on my tuned Crown Vic HPP. Didn't think they worth it, so I wont be doing the stang.

 

What exactly do they do? Make your A/C run slower? Your alternator?