Changing emissions standards are threatening the few manual transmission vehicles left on the market. New rules have been proposed, and some are being implemented, that would limit vehicle movement ...

In the past two months we've covered most of the emission systems that have appeared on recent automobiles. This month we'll conclude our discussion of these systems with those devices designed to ...

To most of us, emission control systems are some sort of "black art" devices that have been forced upon us to rob performance and ruin gas mileage, but that's really not the whole story. Air pollution ...