In Texas you have to pass emissions for 25 years. This is the last year for my '84 5-speed. From now on its safety inspection only - lights, horn, wipers, etc. If you have your car tuned to factory specs, CO of 1% - 2%, you'll fail. So for those of you who don't know the secret is to take a 3mm t-handle allen wrench and turn the adjustment screw 1/4 turn COUNTERclockwise and then check. Your HC level will climb but CO will drop. There is a happy medium in there that will get you by. Its trial and error until you know the sweet spot. Just remember that a little adjustment makes a big difference.