Has anyone ever seen a lightweight clutch for the B18C?
Something like a smaller-diameter housing, alternate material or anything?

My searches aren't coming back with anything.

 

Just to make sure, you're asking for a lightweight clutch, not a lightweight flywheel?

 

yeah...I'm not sure I understand this right. I've never heard of a lightweight clutch. Most aftermarket clutches are actually a heavy duty pressure plate. But, as mentioned above, the flywheel is a different story. There are companies that make lightweight flywheels, and there is also the option to have your factory one lightened.