I always thought the T-toosmall was the same on DSM and on SR motor. Its the same turbo just for some reason the SR cant hold the boost as well as a 4g63...at least thats what the case appears to be to me.

Heres my experience with the turbo:
15-16psi is as high as you can go on 93 octane gas. Above that it will just blow hot air.
Now go get some 100+ octane gas
crank the boost to like 21-22 (wont hold drops off to about 17) and there is a night and day difference. The turbo will still pull on the top end with better gas. Of course with my AFC I can lean it out with better octane and run alot better.
Basically my car goes from mid to high 14s from a roll on pump gas to low 14s on race gas

Of course DSMs have 450cc injectors stock(5speed) so we can support higher boost easier.

NOt sure how much that will help but just thought Id give you my end.

Oh and you guys are lucky in that you run low 13s with the t25 exhaust and intercooler. Strap on a Forced Performance Big28 and you could reach 11s easy with traction gaskets fuel and the other supporting mods.