Quote Originally Posted by Lenny View Post
I have owned both a gtp and i own a gxp currently, and honestly i can say i like the gxp more. i do miss the whine of the s/c, but it was quickly forgotten with the sound of an LS4. the only downfall is the transmission, and like the gentlemen before me have said, build it up first. some stock LS4's have have transmission problems before 100,000 miles.
ok, definiltey sounds like that would be an option.

I've also been digging a bit more and found a few parts that sound interesting.

1. Magnaflow catback exhaust

2. K&N Aircharger

3. Vector performance tune ecm/tcm tune.

It looks like if I got all of those it would improve HP close by as much as 40. How true are the numbers that they usually publish on these?

Advanced auto parts has 20% off online orders and free shipping for until the end of november, so the exhaust and aircharger would be quite a bit cheaper than usual.

Anyone have any experience with these specific mods? Any other suggestions?