You seriously wouldnt bother...but if you REALLY wanted to.... you could quite easily change the mid section of the floor and the chassis rails ...replace it with GTR one's.... or you could put a GTR long rear on it,but then you need the GTR chassis rails...i have done the reverse with my car by putting a GT-T front on mine then changed the rails....this reminds me of my poor 4WD FTO (another unfinished project) where i got a DE2A(4cyl lancer engined FTO)and shoe horned an evo 4 engine in it and f*ked around and modified the tunnel to take a tailshaft and put an evo3 boot floor/rear axle in it....its sitting in saitama,japan with a back in ten minutes note on the window