i have the nismo diff in my sunny gti (with gtir motor) it came out of an almera grp n rally car and bolted straight on. I think the diff is about £900 but the pulsar group of australia is doing a group buy on them at the moment and can tell u a bit more about them.
from my experience the grip is awesome, i only wish i had driven the car with the sunny gti box in first to see the difference (box was fitted at the same time as the gtir lump)
i am planning on running over 300hp fwd, and although it wont be as quick as a 4wd off the line, i dont expect to have any trouble at all against nova turbos, or other 2.0 turbo fwds
there is also a nissan vlsd that comes in pulsar gti imports (the 1.8 ones), not meant to be as good as the nismo one but is still meant to be much better than standard. i have a vlsd on my civic with integra motor, and have never been beaten off the line by another fwd, even ones with much more horsepower.
that 230 bhp remark is total c**p, although i cant prove it till im set up and been to the strip.
