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It's been a long time since I've spent any time on supramania or stupidforums but I know you can buy weld on flanges for the CT series of Toyota turbos. They are not very effecient however. At 14 psi the temps are pretty high.
Depends on the motor they're on.
Both a 3sgte and a 7mgte flow a SHITLOAD more air than a B6/BP, so yeah, they just turn into heat pumps around 14-15psi.
I would guess you'd be able to get closer to 20psi on a BP without temps getting wild.