Gibson 15-18 Chevrolet Silverado 1500 LS 5.3L 3in/2.25in Cat-Back Dual Extreme Exhaust - AluminizedFor the extremist who wants to take their truck to the next level, this dual bolt on Cat back system is for you. This system exists behind the rear tires at an aggressive angle with a powerful exhaust tone. You will gain bold street looks with powerful dyno tuned and tested street performance gains. You can expect to experience gains on average of 15 20 horsepower. Gibson muffler provides a mean performance sound and complemented with polished