Marc, does your car have the original catalytic converter on it? If so, replace it, you'll be amazed at the difference in the hydrocarbon readings after you do. Disconnecting equipment will cause you more grief than it's worth, they were put in there for a reason. You don't say which state you live in but having lived in and around Stone Mountain, Georgia for ten years I've had the go around of getting cars to pass the emmisions test, Good Ruck! Reggie