What are simple cost friendly tips i can do to my TPI?

underdrive pulleys, exhaust and prom burning software. You all ready have the computer I'm assuming becuase your on here

headers, its only about 200 total after you get your exhaust hooked up

I agree to work on the exhaust first as it is the most restrictive...then the airbox.

Prom Tuning is something that can cost only a few hundred dollars, but can yield a lot of drivability gains and it really helps you to understand how your engine works...as well as set you up for any future mods.