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What’s this sound????

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Old Jan 1, 2021 | 7:40 PM
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Default 2020 LT 3.0 exhaust sound

2020 LT makes this sound on occasion, can’t replicate it to take to dealership, and they have “never heard it before” and can’t do anything if the problem isn’t there.... also there’s a strong smell of exhaust in the cab I assume from whatever is causing this noise! Any insight would be great! Thanks!!!
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Last edited by s_m_44; Jan 1, 2021 at 9:02 PM. Reason: Changed title
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