|
Bavsound makes drop-in speaker upgrades for most bmws including the E85/E86 Z4. They're expensive though and only replaces a few of the speakers so it's hard to know how much of an upgrade it'll be. It's $450 and only replaces the tweeters and the speakers in the doors, not the ones in the footwell or behind the seats. Bimmertech does similar stuff but doesn't make a kit for our cars.
If your car already has the DSP system then it's hard to just upgrade the speakers and get a better sound. Would likely have to do something more involved.
|