If you have a android phone, there'* a cheap alternative to having a scanner. The torque app + a $20 obd adapter scans KR. I use it to scan KR and it works pretty good. Its not at fast as an aeroforce, but it a good alternative.

You can make your own CAI, just get a tube from intense racing and a K&N filter.

Yes, the GP headers will work, but you will need a W body dip stick for your transmission.

Tell you what you do, get yourself 3 turbonators and then you...

Sorry I couldn't resist!

I didn't see anyone mention a shift kit, always a good thing to do and pretty easy as well.

I mentioned it. Yes, a shift kit will help. Here you go. https://www.gmforum.com/performance-137/making-installing-shift-kit-4t65-hd-transmission-278802/

dont forget the Larger DownPipe and High Flow Cat

thatll help with the flow and throttle response and will also make the Butt Dyno very happy!

shed some weight (off the car not you) get gooood rubber..good exhaust will help it beath grip and move easier..