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exhaust upgrade

I put some Doug Thorley headers on my '99 2500 Silverado with a Gibson muffler, no cats and single 4" tailpipe. The engine is an '01 8.1L and the sound is awesome. It drones at 1800 - 2000 RPM in the cab. Too noisy for for my wife so it goes to the muffler shop Tues for some resonators. If it was just me I'd leave it alone but it sets off the neighbors car alarm when I drive by.
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