Why aren't aftermarket bearings made?
 

This might be a dumb question but I've wondered why aftermarket bearings and the like aren't ever made? It seems like another way of increasing whp would be to decrease the amount of hp lost through internal friction.

Are transmissions and engine bearings just as good as they can get right out of the factory?

honda oem bearings are pretty darn good. but im pretty sure there are a few companies out there making bearings and the like.