I would like to install a Hypertech ECU on my 04 GT. Would I have to alter the car physically if I install the unit? For those of your who have the units installed, how are they? Thanks everyone.

 

If you're talking about the hypertech programmer III then it plugs in under the dash on the driver's side (forgot what that port is called[&:]) and you just program the CPU from there. I had one for a while, but didn't think it was worth the money. I'm not sure if that is the one you're talking about.