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2007 Chevy Silverado

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5. We pulled our test truck out of Mesa Muffler and went for a ride to find the VT muffler working exactly as Dynomax said it would. And though the muffler will gradually get a little louder at full-throttle since it's a glasspack design (glasspacks break in as the fiberglass packs down), it will remain almost silent when while cruising and the butterfly valve isn't fully open.