Turbo on a GTS? Hmm, the compression rate is already really high on the 2zz-ge, people who want this make sure you look into how much of a gain you really get and know that you will probably shorten the life of your engine, by how much I don't know.
You are really late. There are 6 GTS' in socal with turbos and have been running them for 1+ years. The compression ration is not the only factor in ruining an engine. The turbo is setup for 6psi to run with stock internals. The gain is 40hp and that is on a GT