Greg, I take it there are no clean air programs in your area, I see many vehicles that cross the dyno that are major failures when it comes to NOx and HC. Ususally some kid with a Mustang that has all the toys and can't figure out why it fails... and it producing 3 - 10 times the allowable amounts, and thats only at the speeds on the dyno, now factor this in a freeway speeds or the late night *acceleration* tests and one can only imagine the amounts being spewed out of the pipes. Now when you see a diesel blowing huge clouds of black as it leaves the light in a rapid fashion doesn't that make you sick knowing what it's doing to the enviroment. Now I'm not a tree hugger by any means, I do have my hot rods but they are drivin maybe a handful of times in the year but they are tuned properly and will pass the sniffer tests but yet have been heavily modified for performance use. My daily driver is a diesel with a 4" exhaust front to back and I made sure I had the cat back on it, and it passes the sniffer too, just because I want it to be an eviro-friendly vehicle. The main thing is if we don't do our part who will?