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To me all these axle back systems are pointless, when valves open and you bypass it all anyway. Best sound I've heard is secondary cat and resonators delete / psi or supersprint mid pipe….Ymmv Im going PSI
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2023 F90 M5
Retired - 2021 G82, 2019 440xi, 2020 X7, 2019 X5, 2013 F10, 2010 F10
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