I looked at one back in April, very cool engine, I think it has like 6 o2 sensors.
![Big Grin](images/smilies/biggrin.gif)
I see how they do it, the computer makes the engine run pretty clean on its own. Then they throw a whole bunch of what looks like cats in the exhuast.
Anyway it looks like a good system, and fuel mileage should be in the high 30's.