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Integral Audio does parts specifically for BMW. Their underseat woofers are amazing for the price, they're listed as for the 3 series but I installed them in my M235i with the "HiFi" system and they fit perfectly. Sound upgrade is amazing, they're usually on sale for about $250 for a pair with adapters and spacers. Easily the best value option available at that price and likely one of the better sounding.
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