Just a word of advice, read some magazines and learn what each mod is going to due for you.
By adding a cold air intake(CAI) you might get an increase of 5-8 HP but you might also loose some of the low end torque. And you probably will not feel a difference via the butt dyno.
Not to mention, the G is a pretty powerful car in stock form and you should probably spend some time learning to drive first.
Maybe attend some local SCCA events when they have a novice day to learn the limits of your skills in an environment where you won't be putting others at risk.
When your skills have improved enough to meet the cars limits then look into upgrading the power.
Just my opinion, but I'd hate to see you hurt yourself trying to drive a car that already has more power than you can probably handle.
Good luck.

2003 G35 Coupe 6MT/Black/Graphite

 

Thats a great point, and as i think im a preety good driver already, ive never driven a car with as much power as the G...im only driving my dads Volvo C70 conv. I look into this SCCA events though.

 

Hey Tori

Strongly recommend Gordgee's hyperground kit.

You'll love it.

Alos, ECU is also an option, as the dealer will never know, and it is absolutely maintenance-free.

Gurgen

2003.0 G35S 5AT Aero/Sport
<font color=blue>TS ECU tuned for mods</font color=blue>
Injen CAI
Crawford Plenum
Crawford High-Flow Cats
Fujitsubo Y-pipe/22" Magnaflow Resonator
Eibach Pro Kit