Quote Originally Posted by Reptile View Post
You might as well be.
Nah, little different.

Quote Originally Posted by SlowNA06 View Post
$45 9" open cone intake (K&N, S&B, Spectre) - remove box, slide on cone.
May as well get the most expensive headers you can find, a Borla Catback, a tune for better mileage and power... and the next thing you'd be looking for is a built transmission.
K&N's intake for the GXP is good, Airraid makes a good TB spacer...I think his name on here is GXPSpectre or something and he put a LS6 intake and throttle body on his LS4...you can also delete the Displacement on Demand via a tuner, preferably a HP Tuners program...and use a bigger cam. Doug Thorley sells headers for the LS4 and you can get a downpipe with that I believe. As for the catback...that's personal perference. SLP, Corsa, Borla, Magnaflow...custom? Up to you there. Poly mounts are a good thing too...and Triple Edge Performance makes a mean race transmission...so its kinda up to you the direction you want to take that's for sure...it is just the LS4 platform is pretty limited due to lots of heat and minimal space in the engine bay.