Hey Mcano,
Have you driven a car with a OS Giken LSD? I wish I could have offered you a drive at NSXPO.
It adds "character" which you may or may not like. When I drove past Mexiricer when we were staging for the group drive, he ran over and said 'Hey man your car is broken!'
It makes some popping and grinding sounds mainly at walking speed, especially when it's cold first thing. So of all the mods this is the one that feels like a point of no return as far as the idea of a "race car for the street". I don't think my wife would drive it now because the noises would freak her out.
It is the Superlock 1.5 way and it was installed by SOS, who definitely warned me about the noises. Don't get me wrong I love the diff and will keep it. The traction on corner exits is amazing -- I have been told to get on the gas earlier and harder and I still haven't fully adjusted to what it can do.