A cat back exhaust is a type of aftermarket car exhaust that replaces the section of piping from the catalytic converter back to the muffler. It is typically made from stainless steel or aluminum and can be either a bolt-on or weld-on installation. The main benefits of upgrading to a cat back exhaust are increased power and improved sound. In terms of power, a well-designed cat back exhaust can add 5-10 horsepower to your engine. As for sound, it will depend on the specific muffler used but generally speaking, a cat back exhaust will make your car sound deeper and more aggressive. If you’re looking for an easy way to improve both the performance and sound of your car, then a cat back exhaust is definitely worth considering.