What is a cat back exhaust?

A cat-back exhaust system is an automotive exhaust system that replaces the factory exhaust system from the catalytic converter back (toward the rear of the vehicle). The primary purpose of a cat-back exhaust system is to improve exhaust gas flow and reduce backpressure, which can increase horsepower and improve engine performance. Additionally, a cat-back exhaust may slightly improve fuel efficiency and give the vehicle a louder, sportier sound. Cat-back exhaust systems come in a variety of materials, including stainless steel, aluminized steel, and titanium. They can also come with different types of mufflers, including straight-through, chambered, and resonator styles. Overall, installing a cat-back exhaust system is a popular modification for performance enthusiasts looking to improve their vehicle's sound and performance.