We had an opportunity to snap some photos showing the difference between AGP Delta 46 and the Zeta 2.8 turbos.
Zeta 2.8 on left, Delta 46 on right.
These two turbos are almost identical in terms of size, however the max power output varies between the two by about 50-75 hp.
The Zeta 2.8 can produce up to about 500 wheel hp, whereas the Delta 46 can produce up to about 450 wheel hp. The difference in visible measurements? not much.
Zeta2.8 inlet inducer 2.08 exhaust wheel inducer 2.16 inches (billet wheel)
Delta46 inlet inducer 2.10 exhaust wheel inducer 2.13 inches (cast wheel)