Help Me Mod Up My Engine Performance

[D0P35T]

Hi, I just bought a 2006 Infiniti G35X Sedan automatic. It has brand new rims and tires as well as brake pads. Also has a cold air intake installed. Brand new complete factory exhaust system and headers installed. Other then that, it's all stock performance. I'm curious as to what type of engine modifications I can do with an automatic transmission to boost the hp and performance. Any help would be greatly appreciated since I'm new to the "car world". P.S. I just got my license December 3, 2012 so all help is greatly appreciated haha thanks.

[Razi]

Aftermarket headers and exhaust might increase the horsepower a bit, but I don't think you'll see any dramatic increases in power with just bolt-ons.
It's just a sedan automatic, so keep it well maintained and happy.

[audtatious]

Look into a tune. Uprev seems to be the tune of choice. Also, if you are not running hi-flo cat's that would be another direction to free some ponies up.

[SVTCOBRA]

It's just a sedan automatic,

Really????
Oh, wait...********************************** decided to censor myself.

How about a plenum spacer??
Have heard that they are the biggest bang for the buck.

[audtatious]

+1 on the plenum spacer