My 05 GT is going to get a Hellion Turbo soon. This will raise the RWHP to around 450.
I've seen too many Mustang's go out of control with over 500 RWHP. Too small and light
with too much HP and TQ.
I have a close friend who just bought a 2017 GT350, he's looking at doing twin turbo set up for right at 1,200 HP. Hope he's a good driver because it would kill me to lose him.