New NOx cat.

[omgwtfbyobbq]

Stolen from GCC.

Our new cerium-oxide additive is the breakthrough that makes it work. When it?s combined with Cu-ZSM-5, the resulting catalyst works at normal exhaust temperatures and is actually more effective with water vapor than without it. With a lean fuel-air mixture, it removes as much as 95-100 percent of NOx emissions.

PM filters seems to work reasonably well (except for Ford's version), so with NOx out of the picture, 50-state certification some time in 201x should be doable. Hopefully it'll get to the market and VW will bring the 3L, or better yet 1L, Lupo, over. Or maybe a 50mpg 4x4 pickup truck...