No idea, it came on the car and the trader said it was a compitition rear diff in it.
he said the clutch and gearbox was uprated too, and there were. found that out after i broke them.
i ripped it to see if i could get a name on the two cogs. i couldnt get it all out.
its way tighter than the standard diff i have in now, i kinda miss it.
it had to come off for the nct, he failed it because it was too tight
if i can get it out of the casing il bring it upto the trackday.
um I dont know, now that i think about it doesn't the v4 have a r160 diff, can anyone confirm this ? dont know what came in a 99 'r , can you say for sure its a 180?