I think it's this model?
NX4-HDR4 // Advanced Clutch Technology
It came off my friend's 91 240sx years ago so I'm not sure. I know it wasn't used much and I had a similar model in my 400 whp sr20 s13. It's definitely a firmer feel than stock with a lower engagement but I never found it to be too much even in traffic. Sorry that's all the info I have. Hope it helps.