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That compression is stupid low, no need for that. 9:1 should be fine, i'd personally retain stock compression but that's just me.
Yeah a .42/.48 is a burnout turbo, it'll definately run out of breath up top. Thermal's suggestion is pretty good. You could probably get away with a .60/.48 with a super 60 wheel, which should be responsive all around, not sure if it'll flow up to 280 though....
Tune with crome. I swear by it, it's easy to use and very powerful. Plus, it's FREE!!
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