What numbers are you using in the turbo calculator?

Here's what I plugged in.

Bore - 3.425 in
Stroke - 3.57 in
Number of cylinders - 4
RPM - 7000
Ambient air temp - 25 celsius
Engine VE - 110
Boost pressure - 6 psi
Compressor efficiency - 75
Intercooler efficiency - 70

That produces an air flow of 26.7 lb/min at a pressure ratio of 1.43, which is way off the map for a GT25R (there's no plain GT25--the R at the end means it has a ball bearing center section).

The H22 flows a lot of air even at low boost levels so the GT30R is the way to go to insure you don't totally fall out of the compressor's efficiency range at higher rpm.

Oh and I guess I failed to mention that Garrett GT turbos are really freakin expensive. For something more affordable both a T3/TO4E 57 trim and T3/TO4E 60 trim will do the job with efficiency but they won't spool quite as quickly as the GT30R. Of those two, the 57 trim will spool quicker than the 60 trim.