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The pipes were small though, only about 2" I believe. When I had the '98 I thought duals were better, at least for sound. But, seems like a single exhaust with a single in/dual out muffler sounds way louder than a true dual from front to back. I actually had a "proper" dual exhaust where it had an X pipe. True dual is considered to be duals. Proven Ground C&L Series 3-Inch Single Exhaust System with Polished Tip; Side Exit (14-18 4.3L Silverado 1500) $339.99. Flowmaster FlowFX Single Exhaust System with Black Tip; Side Exit (11-18 6.2L Silverado 1500) $499.95. Hooker BlackHeart Dual Exhaust System with Polished Tips; Rear Exit (09-18 5.3L Silverado 1500) $846.95. PROS: Less resistance allowing for faster flow out the muffler. Increases performance. Increases noise levels based on RPM, more mellow sound at cruising speed and idle. Straight-through mufflers allow for mellow sound at idle, but aggressive deep tone at wide-open throttle. In summation, there is a lot more that goes into picking the right.