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A good turbo for you I think would be the S258 with the smaller cover. I think this will flow about the same depending on how much boost you plan on running. I think that the extended tip turbos are already underrated as far as trim size goes and above 15psi they will flow an extra 6-8 lbs/min. Here are the trim sizes as shown in the catalog.
S256 49 Trim
S258 53 Trim
S362 54 Trim
I would say that if you are running in the upper 20's as far as psi an S258 would probably flow as many lbs/min and spool up over 1000rpm sooner.
I spoke with AWDer about his S256 and how it performs at about 6000ft elevation. We both were pretty impressed so far and i'm sure he will be posting more results in the near future.
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