Do you need back pressure? How big should your headers be? Today, we interview Richard Waitas, Senior Manager at Magnaflow, to learn how an exhaust system actually works. Learn on Monday, wrench smarter on Sunday. Introducing a NEW series on /DRIVE, aimed at educating you to build a faster, better, more reliable car: /ENGINEERED. We want to empower our fellow enthusiasts to know more, and do more, by learning from some of the best engineers in the game.