The 02 748r should have the bigger airbox (it mounts in two parts with the lower part mounting to the heads, and it should have shower injectors. The frame is different to accomodate this bigger airbox as well. You cannot put an R shower injector set up in a stock non R frame without cutting up the crossmember. I hope this helps. If you would like pics PM me and I can get some of each style to demonstrate tonight. Brad.