Here’s a fun question that you can use to fire up just about any message board: what does a high-horsepower engine like better: a 3″ exhaust to breath better with, or a 2.5″ exhaust that offers up a bit of back pressure and that opening up the flow of air out of the engine will cause the power to fall off of a cliff faster than Wile E. Coyote when he’s within a lunge of the Road Runner’s tail feathers. Truth is, any four-stroke engine is nothing more than an air pump that is powered by controlled explosions. The better you can get air to flow, the happier the engine will be. To put this whole “back pressure” deal to bed once and for all, Freiburger and Dulcich head back to the dyno room at Westech with a 620-ish horsepower Chevrolet 454 and enough exhaust tubing to plumb the Titanic with to prove once and for all that an engine loves to breathe. How much power will be lost between the mufflers, and more importantly, how much power will disappear with the exhaust system, period? Hit play below to find out!