If they were for GTR, still possible to install on GTT. The only thing differencs is the length of your cat (or decat) pipe joining to the downpipe flange. Can ask any exhaust shop to fabricate it cheaply.
Oh SNAP! That's what happened to my boot-release cable recently. You know, the one where you just pull the lever near the driver's seat and it opens the rear boot? Well the cable snapped! After asking around, not...