The AAC and stainless bearings were big selling features for Enya. Since they have dropped the AAC and ss bearings in the two strokes they have fallen behind farther. As far as I know the only engine they now carry with ss bearings is the .53 four stroke.

It's kind of funny how Schnurle (sorry Dar) porting had been around since the thirties but everyone wanted to wait for the patents to run out.