Hi guys. I just bought a black R31 coupe. It's got a RB20 non-turbo engine with a auto tranny. Pathetic I know, that's why im posting this. I would be doing all the work myself (with some help). How much work is it to put a RB25DET engine/5-speed box into my R31? Will it bolt straight in or is it alot of work? How about an RB26DETT? Obviously more work, but will a RB26 fit? I know RB25's are alot cheaper, but which model engine should I buy, a series I or II or NEO (R34)? Are the gearbox's from all RB25's interchangeble, or do I need to get the same box from the same series of engines? Also will the stock drivechain cope with the extra horsepower and will the 4WS get in the way at all? Any help at all would be greatly appreciated guys.
