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Less resistance allows the wg to open easily. The backpressure is what keeps them closed according to my tech
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2019 BMW X5 50i Mineral White/Tartufo all options including M Sport
2022 Porsche 911 C4S Silver/Brown
2023 BMW iX M60 Black Sapphire/Amido, Titanium Bronze trim/22
2023 Audi RS6 Avant Daytona Gray/Black
2024 BMW X5M Comp Brooklyn Gray/Taruma Brown, Titanium Exhaust on order
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