Mike,
Where did they get the figures that will pass from since there were none ever established that I am aware of? What happens if they don't pass the tail pipe readings? That is why up here they just did the visual on my neighbors pickup and asked about any chip change. They don't have any base to do a tail pipe emission test. And they can't just use the new car figures as they are for gasoline. I am not sure what they do about the diesel cars as I don't know anyone that has one.
Ron