Most enthusiasts think of the exhaust as starting from the manifold back, but the exhaust system really starts at the exhaust valve. A small increase in exhaust port flow, especially with stock ...

Across the United States, a crucial piece of emissions equipment has quietly turned into one of the hottest targets for ...

The Ford Mustang's active exhaust system is more than just an auditory gimmick -- it's a performance feature engineered to balance civility with the bellowing growl muscle car fans expect. Introduced ...

There's a lot going on inside your vehicle at any given time, whether you're idling at a red light or driving at freeway speeds. Much of this activity involves chemical reactions that — while ...