Bought and welded to a 2014 Silverado 5.3L. A 3" pipe was connected to the muffler with two 2.5" outlets. It was DEEP when it was first launched. Although it sounds amazing. I bought it for its semi-aggressive sound and it was a bit more aggressive than intended but I really like it. In combination with CAI I noticeably improved performance and throttle response. Definitely recommend, with the caveat that the size of the whistle you use affects how deep/loud/aggressive it sounds. Excellent purchase!
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