My wife's 2015 X3 really needs some kind of headlight upgrade. They are currently very faint. I replaced her old bulbs with PIAA H7 Hybrid 3900K bulbs, and we don't see any difference from her old stock ones. The plastic housing looks great, clean and completely clear.

Could there be other issues here, or do I just need to buy better/brighter bulbs?

For reference, this is what I bought. They are far from extreme or white.