-Front and Rear coil springs
-Front and Rear stabilizer bars
-Front and Rear Shocks

Would it be worth getting these GT parts put on my 2007 Pony Package V6?
And what are some good prices?
Thanks

I would say you're better off looking for aftermarket shocks. Consider the Tokico D-spec line: they're adjustable and have worked well for many that are running them on this site. Stabilizer bars... if you got the pony package you should already have the bars I believe that are from the GT. Springs, you'll also want to consider aftermarket most likely, though it really all depends on what you're trying to set your car up for.

No.

You've got everything already. Instead, pick up a set of Vogtland (Steeda) springs and some Tokico D-Spec or HP shocks (non-adjustable, perfect if you're not road racing), and a set of decent LCAs with anti-squat brackets. That'll lower the car and firm up the ride a bit, while actually improving cushioning over shocks and such, and the LCAs will largely eliminate the demon wheelhop.

So upgrading to GT suspension parts wouldn't do anything? My dealer just gave me a huge list of takeoffs and I figured the GT suspension would be a solid upgrade. Anyone out there that has swapped any of the parts?

You already have the GT swaybars, they come with the PP. Don't bother with the GT springs/shocks/struts just get some aftermarket ones.

on my moms 07 pp stang the sways are smaller size then the gt sways not by much but they are not the same, so they would probably not offer any real benifit if you have the rear sway already.