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If your car has aux-in available you can use a headphone amp but you could lose ability to charge if your iPhone doesn't have headphone jack.
None of this is optimal from a sound quality perspective but purely to make your questionable source content sound louder which was your original ask.
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2022 Macan S
2016 F31 328i xDrive Sport Wagon
2006 E46 330ci ZHP Convertible
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