The extra plate kits are good, but the new technology is single sided plates.
In a conventional clutch design there are friction plates and steel plates. The friction plates have material on both sides.
Single sided clutches have friction material on one side of both types of plates.
Alto makes the clutch plates for almost everyone. All of the car manufacturers and motorcycle clutches get their plates from Alto.
I spent perhaps an hour talking with the Alto sales director at the last V-Twin Expo. He went into great detail about the single side technology, how cars have had it for several years, etc.
I put a Carbon, single sided clutch pack in my red FXR last month and really like it.
Alto does not sell retail, and I was unable to find the carbon single sided clutch in any of the big retail catalogs, but did find it on the AIM website.
Here is the link: