You've known about (and heard!) Flowmaster's high-performance mufflers for a long time. Now, here's something for your '75-later car or truck: Flowmaster's Direct-Fit high-flow catalytic converters.

A catalytic converter has one primary benefit and primary one downside. First and foremost, it reduces the toxic gases and pollutants from your exhaust by… wait for it… catalyzing them. Because cats ...

It's Mercedes C63 AMG tuning season around these parts, as we now bring you the Brabus B63 S to complement yesterday's RENNtech version. So what hath the Brabus folks wrought? It's not quite RENNtech ...