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.
As the title of this thread, any recommend on the shop that can refurbish and change the air-cond for RX7? I've just bought my 1st RX7 FD3S recently, and i'm trying to refurbish the interior and change the air-cond...