Hey champ!
RB25 boxes and GTR boxes are the same, the only difference is there is no transfer case for the 4WD. Im the long run i want an RB25 box for my 32, the rumors ive heard of RB20 boxes arent the best, and im sure you have heard the same ones im talkin bout.....
Coolers, i dunno, i just used got one cause i wanted one, i didnt really go into a great deal of thought on price and/or performance. I just followed everyone else and got a hybrid copy one.......