It’s not surprising that aftermarket exhaust upgrades are one of the most popular mods for Focus ST owners. While the stock system is just fine, a performance-oriented exhaust will really unlock the potential in terms of sound and power. If you're unsure where to start, you can check out our Focus ST exhaust guide for a helpful overview of some different types of exhaust kits.

CJ’s offers a great variety of top-notch cat-back exhaust options for your Focus ST, allowing you to pick the style that works best for what you want out of your car. By replacing the factory mid-pipes and muffler, you can get superior airflow, allowing for more horsepower and torque.

With either a cat-back or axle-back exhaust kit, you’re also going to get a great improvement in sound output. Whether you want your exhaust note to be a subtle yet sporty upgrade from stock or a loud, track-ready roar, we’ve got something for every driver. For the most affordable option, you can simply swap out the heavy factory muffler for a performance-oriented one, which will also give you a deeper, more aggressive sound.