stock for stock the gt can't push that much more boost tahn the gts 10:1 is almost as bad as 11.5:1. teh extra boost will make up the difference in compression.
the gts might have more tq then the gt, but its only 4. The gt haas 126 and the gts has 130. what makes the gt better then the gts is that the gts is a short-stroke that gets its peak 130lbs tq at over 6500rpm, while the long-stroke GT gets its peak tq of 126, at only 4000rpm, the gt is a lot torquier, and when the gt and the gts have the same amount of psi of f/i, the gt gets more hp and tq out of it.
Lets look at the sf Turbo kit for a prime example of the benefits of a gt for f/i. The GT at only 6psi, comes up with 216hp and 180lbs tq, the GTS with 8psi, comes up with 240hp and 170lbs tq, ... do you see it now!!!
And that was only at 6psi, imagine throwing in 8psi for the GT, and you'll have more then 240hp for the gt, and oh yeah, a heck of a lot more tq...