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Cheap tuning?

I just finished building my engine last week, I've got K1 H-beam rods, Wiseco forged pistons, ARP head studs and a Cometic head gasket, so I want to turn up the boost. It's a FMIC. Right now it's running 8 lbs, I'd like to reach 15 lbs. Anyway I know nothing about tuning and I'm practically broke at this point (building a car and going to college don't go well together), whats the cheapest way to get my car running properly on 15 lbs of boost? Obviously I need to start with a 15 lb wastegate, but once the turbo is making 15 lbs, how do I get the computer to agree with that? I've tried to read into it but I don't speak tuning, so I'm stuck.

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