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  1. Chevy Silverado Forum (GMC Sierra)
    My 2003 5.3 Silverado has no cats and a thrush welded muffler. Recently I had to drive a long distance so I replaced the Thrush with a stock muffler. After the trip, I put the Thrush back on, and the drone is much louder and a lot less bearable than before I reverted to stock. The only...
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