Built b16, hi comp + boost ??

[Davo]

All the GT2xxxx turbos have same bolt pattern and will fit the same manifolds. GT3xxx Is diferent bolt pattern (and easier to find from the US)

not always, i had a GT3071R with a t28 .64 rear housing.
The 28 or 30 just defines the exhaust wheel size and the 60/71/76 generally defines comp wheel size.

personally i wouldnt be goin larger than a t28 on a high comp b16 motor simply cos the efficiency of anything larger than a t28 will require more boost to make it efficient.