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the reason people usually use GT28s is simply because they make decent power, respond/tune well and keep the cars power band nice and wide. i ran an S14 T28 on my last SR that made (again) around 268hp and 254lbs of tq to the wheels on a mustang dyno (which is roughly 310ish HP on a dynojet). and that was with no head mods whatsoever. i was planning on building the head up a bit, but wound up selling the car before i that happened.
i run an S15 specR T28 on my current SR with a stock ECU and just basic bolt ons. it has a great power band at 12psi and pulls hard to around 5000rpms and levels off (this is because im running stock SR injectors and their duty cycle is maxed out, if i could add more fuel it would pull even harder). the power band is predictable and easy to use.
larger turbos require a lot more tuning and head work than small T2 series do, but they CAN be tuned to make tons of power all the way up to redline (power that far exceeds T2 series simply because of how small they are). CFM vs CFM, the GT30 wins hands down, but you need to build the motor around the turbo. Ease of use, the GT2 series wins because theyre small and spool REALLY easy on the CA/SR/KA
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