Just do TONS of research and slowly piece together your own setup. There is no need to rush a process like developing your own turbo project and the more time you spend on the research and careful selection or parts, the better off you will be.
It will be way cheaper building your own if you are in any way considering the Alphatuning kit. I'm gonna start my journey in the forced induction world shortly so hopefully you can learn alot from me. I still have things to learn but I'm learning more and more every day, and I feel comfortable I can tackle a project like this.
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