The GT and the GTS are both good for Turbo, but some factors come into play. If your running high boost, the GTS is not good for that, even if you change the compression. Heres a reason why, IMO, the GTS has shorter rods then the GT, the GTS also has lift, so if your running at your maximum that your engine can handle, lift will give you more and blow your engine, so you would have to lower boost. With a GT you dont have too. IMO, the GT is best ofr Turbo, Heres why, again IMO..THe GT has a longer stroke, you can easily get a bigger bore, since the sides are not as thin, you can bore it out more, so you bore it out, and you good, well, also lower the compression. Also, with longet stroke, youre looking at better midrange power and better tq, look at the dyno charts, the gt gets more hp and tq per boost level then the GTS does. The GT and GTS might look like there doing the same thing with HP at same level of boost and GTS might be getting more, but the GT still has more tq at any level of boost, then the GTS has. And once you start boosting at higher levels, the longetr stroke on the GT will start to play a major factor, becuase its better to have a longer stroke with the Turbo.. and you cant prove that with your GTS becuase it cant handle that much and even if you do beef up your internals, the shorter stroke, after high boost, wont let you get a lot compared to what the GT can give you. The GTS has a shorter stroke to give it more N/A power, the shorter stroke is what allows it to rev to almost 9000rpm, but all in all, IMO, i think the GT is better for Turbo systems, because of no lift, being able to bore it out better and easier, longer stroke...and to me the GTS is an awesome N/A car to build up, but thats it. You can get more power per level of boost with the GT, then you can get with the GTS at the same level, it just doesnt handle as well!!!