I should add, at this late date, that I did the Jehnert upgrade for the underseat mid-woofers, and it was worth it. Not a huge increase in mid-bass, but you can definitely tell a difference in the quality. Not muddy anymore!
Probably get the same increase in quality with the BavSound underseat woofer upgrade, as well.
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2015 Black Sapphire Metallic 6MT M4
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