For your initial project: 400 hp at the flywheel around 0,5 bar of boost, if you have a GT3582R which is the best A/R 0.63 now A/R 0.82 or A/R 1.06 ?
I think that it is necessary to know the good A/R for you now...
I think that you need a real professional to answer has this question. I know only Chris (TURBOKRAFT) who is capable of answering...
He has a lot of experience with Garrett GT and he is enormously known in FRANCE, in PORSCHE fan clubs. For me is the best.
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GOOD LUCK