If you're looking for one mod that can improve your 2018 Mustang's looks, performance, and sound, a cat-back exhaust is a perfect choice. By replacing all of your exhaust components from the catalytic converter back, you'll be able to remove the resonator. The resonator changes your exhaust note and is also restrictive. By letting the exhaust leave more freely, you'll reduce backpressure on your engine, freeing up horsepower.

Each 2018 Mustang cat-back exhaust is going to have a slightly different sound. This is affected substantially by the mufflers that each comes with. Cat-back exhausts that are marked as "very aggressive" or "for off-road use only" are going to be very loud. If you're looking for something that will keep you on good terms with your neighbors, then a street-friendly exhaust would be perfect. With a deeper exhaust note, you'll still get a rumbling powerful sound, but it'll be one enjoyed by enthusiasts and ignored by your neighbors.

If you opted for the active exhaust system, you can still get an aftermarket exhaust that will customize your note while preserving the active exhaust features.

Many 2018 Mustang owners struggle to pick between an axle-back and cat-back exhaust system. While both offer sound and appearance benefits, the cat-back has significantly better performance gains. Additionally, once you've deleted the resonator, you'll have shed 25-30 pounds of unwanted weight. The increased airflow and lowered mass will improve your driving experience and your fuel efficiency.