Boom for your BMW
You love your BMW, but need more bass than the original 6-1/2" underseat subwoofers can give you. Or maybe want to install an amp, but the original speakers can't handle it? MATCH by Audiotec Fischer designed their MS 8B-BMW.1 8" subwoofers to fit in the original enclosures, and they'll fit into your budget as well.
More on the floor
Made in Germany, these subs feature special baskets which fit perfectly into the original BMW underseat enclosures without modification, so installation is pretty simple. They're built with fringe-field neodymium magnets and extra-large voice coils, so they they can handle up to 100 watts RMS each, and they use gold-plated screw terminals for better conductivity. Whether you're looking for more power handling or just more thump, the MATCH MS 8B-BMW.1's could be right up your strasse.