if I am not mistaken the HK underseat woofers are 8ohm, and would actually get less power than your stock ones due to them being either 4 or 2 ohm... I can't recall offhand. the door speakers are the same ohm rating though so would be an easy change if they mounted the same. I don't see it as an upgrade though worth paying for.
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2019 X3 M40i - Phytonic Blue - MST Intake, VRSF Chargepipe, ER catted/coated DP, Dorch Stage 2 HPFP, BM3 stage 2+ e30, XHP stage 3, 275/40/20 Michelin MPS4
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