Post by
PantherRacer »
https://forums.nicoclub.com/pantherracer-u15735.html
Tue Sep 22, 2015 4:57 pm
Yeah, that is a T25/T28 flange.
Easiest, most reliable route would be to get a turbocharger with a T3 flange, or buy a T3 turbine housing for that turbo (as they are pretty popular and some have housings suited for RB20/RB25).
If you can find a T25-T3 adapter, you'd have to make sure everything still lines up underhood, as they usually put the turbo some distance from the original mounting point on the manifold.
I don't know if you'd find a T28 flanged manifold for an RB20...I think that might help it run out of steam quicker due to the smaller size for air to go through.