Header addition ? power
U could get a 100 shot NOS before your TC and gears (I assume u have a GU5) 3:23. It's cheaper and only used when needed. Also with 3:73 ur MPG will hurt a little more. Get bellows, pullies, ported or GMAF.
Get your car on the dyno to be able to monitor your gains and have a baseline for the future.

