Quote:
Originally Posted by mindcraft
What is the easiest / least modification way to upgrade my stock HK sub to something more tight/hardhitting? I am looking for under the seat installation. I read posts on the subject but they are from 2015... wondering if we have some recent updates on this topic.
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Bavsound.
https://www.bavsound.com/BMW-Underse...oofer-Upgrades
They sound a million times better than the stock HK ones.