Unfortunately we do not have any upgrades compatible with the B&O or B&W audio systems.
The B&O/B&W system is suppose to be top of the line and there aren't many of them made, so we will not be investing time into developing upgrades for them.
For the Bang and Olufsen system, our Ghost subs do fit in the under seat compartment however, the B&O amp signal will cause our subwoofers to blow after mild use. For this reason we cannot offer them as compatible to your B&O or B&W audio system.
Our kits are designed and tuned specifically for the vehicle intended. We only recommend using the kit for your exact vehicle through our website's vehicle selection options. So, if it is not listed we highly discourage trying to make another kit work.
Thank you so much for considering Bavsound for your audio needs. We truly appreciate it, and we wish you all the best at finding upgrades for your vehicle.