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It's never going to sound spectacular but try a mid-pipe and valve controller. Cheapest starting points with the S58. Also, your wife's SQ7 is a V8, so I'm not surprised that it sounds better lol.
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Current: 2024 BMW M3 Competition xDrive | 2022 Audi Q7
Gone: 2022 Audi RS5 | 2020 BMW M340i | 2019 Audi RS5
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