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.
hehe Just want to share with all skylinerrr guy...
soon my brother car will have a turbo upgrade....there is a few option to go but budget quite tight...my Hp target is around 300 rwkw street setup..Try to do this...