Sorry, one more thing. GTS 4 Ben, I don't think a single turbo mod would be any cheaper than a TT mod. In fact it could be more expensive as in a single set up, you would have to change a lot more things (manifold, induction pipe etc). That's why a single turbo always come in a kit for the GTR. The TO4R kit comes with all the required bolt on things including a monster wastegate and really well built manifold. In Malaysia it cost about USD 5K while my 2540 just cost USD 2.5 K. The engine parts are the same anyway - cams, valve kit, pistons, oil pump, fuel pump etc.