What should I use when upgrading my fuel on a turbo application? I've heard of using a FMU and upgrade my fuel pump. Will this work or should I go another way?

 

Fuel pump, Injectors, fuel rail, fuel pressure regulator and tunning

 

Or if you're cheap and still want it to be good, just get properly sized injectors and a larger fuel pump, then have it tuned. The stock fuel rail is more than sufficient to support most low-boost to moderate-boost applications. And an aftermarket FPR isn't always necessary.