GT works much better as far as FI goes, due to its lower compression.
While yes the GT has far less power than the GTS, it has its own advantages as well. The most noteable of which is its output of power in the lower rpms.
There are currently 2 Turbos available for the GT model; one from DA Sports, and the other from Stafford Fabrications.
Both Turbos should put a stock GT upwards of 195+ whp
The GT's capacity for holding more boost can be further increased by adding some low compression pistons from www.monkeywrenchracing.com
I hope that I could help you out, please let us know if you have any other questions.