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I did the Bavsound Stage1 and subwoofer upgrades. It's a definite change for the better. Much better midrange and bass response, especially at high volume. Bass is much tighter and punchier specifically.
I may do the Amp upgrade soon but none of the options have been certified for the G8x that work on the G20. It will likely work but someone needs to take the hit first before I dive in.
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2022 G80 M3 AWD - Voodoo Blue
2020 G07 X7 M50i Tanzanite Blue II
2016 F80 M3 YMB *SOLD*
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