A lot of interesting theories here. I can tell you that the turbo manifold size is a non issue at up to 1,000HP so let's just get that out of the way. this is through proven dyno runs/testing.
Ideally, you want to go with a much larger turbo, like a 72 or 76mm compressor, with a similarly sized turbine wheel. This opens up the turbine restriction, greatly decreases EBP and in tern significantly lowers the IAT's.
Things to consider upgrading...intake, and downpipe, perhaps to 3.5". We now offer a 12" tall core FMIC which is a direct bolt on upgrade. That is something worth considering as well, if going up to this sort of a turbo size, to make a lot of power.
Like many kits on the market, the Boosted Performance kit is centered around covering 99% of the market demand. This is why the 6467 turbo is standard with the kit. It is capable of 700whp, with a mild engine build. We offer the TT kit as well, with turbos going up to 6265, which are rated at 825HP EACH!
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