A windage tray also scrapes the crank as it goes by, removing excess oil. It doesn't actually touch the crank, but it's about 1mm off.

I'll be really honest folks, don't get excited about one. The 4G63 unit will NOT work. the # of people out there that would actually NEED one are about 4 or 5 people. You wouldn't see any significant gains on a midly modified motor.