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If you get an amp with high level inputs, you can tap into the underseat speaker wiring and use that to send signal to amplifier.
I'd recommend a mini amp as they are easy to hide behind trim panels in the boot. I use a Kicker Key 500.1 and it does the job well, but I'm in a country with limited brands.
I have Focal underseats running off a Kicker Key 200.4 amp and they add a bit of bass but not enough to justify the upgrade cost. Far better to go the subwoofer in the boot.
As a comparison, wifey's car (F10 530d) has the HK system and I find it completely underwhelming.
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