So theres ProCHarger,Vortech and Paxton. Which one would you recomend on a stock 2008 Mustang GT? Is it safe to run 10 psi or should I rather go with 5-6? And they claim 420-480hp, Is that with bolt ons or stock and adding only the supercharger?

 

I'm a fan of vortec. Procharger uses an intercooler but I'm not sure how good their blower units actually are. Paxton does pretty good I haven't seen them last that long. My recommendation would be Whipple or roush kit. Positive displacement style I prefer.

 

I ran a paxton for a few years and loved it!

 

I had a Vortech V2 S-trim on my '07 GT Automatic. Stock engine otherwise, and it made 11 psi at 6,700 rpm (the shift points I set for my needs at the dragstrip). Non-intercooled and it made about 480hp at the flywheel (393 rwhp on a stingy Mustang Dyno). Great daily driver, super reliable, and it ran hi 11's in the 1/4 mile (best of 11.79 @ 114).