[beige]

I have an E93, with S677 (HiFi System Professional DSP) sound system.

My right passenger subwoofer is producing noise.

Looking for a stock+ upgrade that that doesn't require me to replace AMP, cables and my life.

I am looking at the Focal ISUB BMW, but they have two options, 4 ohm and 2 ohm and for the life of me, I can't figure out from research which is the better option for me. Any recommendations?

Stock sound was good enough for me, so anything that is 10-20% better should be more than enough.