Need help! Stock xr6t customisation

[Certifiedxr6t]

Hey guys wondering what mods should I do.
Have a budget about 6-7k. 
How much kw would I be able to push?
Only modifications done to it is 
- Turbo Side Intake

I’m thinking of 
Stage 2 intercooler 
A turbo back Exhaust 
Do I need Valve springs? Heard they are hit or miss some cars need it some don’t?
Stage 1 tune

Any other things I should be looking at? Let me know. 
Thanks guys!

[Puffwagon]

How much per you can make is somewhat dictated by what model car you have.

 

It also depends on whether you do the work yourself, and whether you tune it yourself.

 

Let's say you've got a late model bf or an fg, you'll get high 400's at the wheels with a turbo swap and E85.

 

I'd recommend valve springs every time unless you're happy to stay at the 12psi mark.