In my opinion depending what you want to do if its about track stuff I strongly suggest a clutch lsd in general. As far as longevity with Cusco from what ive seen in the pass on my350z dot com . There has been a lot of them running it for years including drift . I havent seen anybody as far I can tell having to rebuilt it... what they endup doing is changing the locking ratio from 60 to 80 then 100.... dont forget also on the cusco RS you can switch it to a 2way if you want. I cant say for the other one..
The nismos lsd was also quite popular in the pass because it use to be very cheap 800-900$ the only issue some guys were complaining about the noise of it more than other clutch lsd...
I can say for the os giken. They are a brand name and all I know is some guys had problem getting info and parts to tune the lsd.
This is why I went to a cusco rs .. 2 of my friend is running it . One use to have a kaaz which is another clutch lsd in similar price range as the cusco .. unless it changed in the last year or two.
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