There was a recent post on the r forum, but I was confused about the final answer.

I would like to know if the itr pp and clutch would work on the b16a S1 cable tranny. I've read that the pp and flywheel would work, but am unsure of the clutch. This would be on a mild NA ls/vtec (180whp), would this be a problem?

Thanks.

 

The spline size on a itr clutch is bigger than the one on your s1.

 

Correct, the ITR trans uses the bigger 92+ spline size, you can use the ITR pressure plate, but you will need to buy a disc for a 90-91 Integra.