a little bit of info for anyone thinking about the P11/B15 transmission swap
A great swap guide with pictures can also be found here: http://www.sr20forum.com/showthread.php?t=97257
some more useful info, can’t guarantee it’s %100 correct, but it seems legit
http://www.sr20forum.com/showthread.php?t=104113
basically the general concensus is that a B15 LSD trans would give you a more ideal ratio for N/A, where as the 2000+ P11 LSD trans is better suited to a turbo car however, the 99 P11 transmission is the same as the B13/14
and if 5 forward gears arent enough, the Spec-V 6-speed QR transmission can also be made to work with the SR. http://www.sr20forum.com/showthread.php?t=175334