Originally posted by euro
the 88 89 z31s have a t3 flange, but with t25 compressor and exhaust wheels.
Just curious but what was the reason behind this? better off throttle responce? Why not just make it a standard T25 with a standard T2 flange?
The only thing I can think of is that it saves money engeneering and production wise to continue to cast the same manifolds as the previous years as to not have to retool your factories..