This Silverado/Sierra 4.8/5.3 cat-back system compliments our intake in the way it installs, looks and specially the way it performs. Designing the right bends and the research and development on the muffler from the amount of backpressure to the smooth exit have made the intake and exhaust a great combo. Volant dynos all exhaust with our intakes or with the stock OE equipment not with other aftermarket systems. So if you already have an intake this is your exhaust.