When I had a GT35R it was on song (26psi) by 4400rpm. This thing is laggier than that, id say T04Z territory.
These aren't a big turbo physically which is surprising to see what they produce. Looks like a GT35R from the front but the rear housing looks quite large.
The blade design on the turbine side is also something I haven't seen before, it is like the blades are convex. (if that makes sense)?
Just to add, I have seen 2x SR20VEs with these turbos making more power and on earlier than my T51R KAI RB30/25.
One ran 154mph and the other 148mph, both 5 speed H pattern cars.