ah this all seems very de ja vu. Dont even worry about puting the gtr box on for rwd applications i have looked into this and that cheeper gtr box sounds great but the mods you will have to do will cost more than just bolting on the gts-t box, and you havent even got the gtr box in the car yet. listen to sydneykid he knows all about this stuff and saved me lots of $$$$