If I wanted to run a T3/T4 turbo whould I have to upgrade my fuel system if I plan on running the psi I am now. I want it basicly to hold boost better at higher RPMs. I have no desire to run more than the 15psi I am running now.

 

year or car would help

 

2001 1.8TQM sport

 

Yeah you would have to upgrade the fuel system. A k03 moves a lot less air than a t3/t4 (think volume, not pressure), so you'd need the fuel to keep up with that added airflow.

 

so what size ingectors would I need and what size FPR would I need? Would I needd to get a chip or would it be something I could get dyno tuned?

 

swapping to a t3t4 and running 15psi is stupid. You want to hold more psi, get a ebc and you can get what your looking for. Your thinking about spending $3500 for a t3t4 setup with a 450hp turbo and running it at 15psi. You would only make 240whp and hit 15psi at about 4k rpms.