What do you mean by configs? Could just be a matter of replacing a couple of the speakers. I don't solicit anyones goods, but I have had AWSOME results with KOVE AUDIO components. I guess it really depends on what you looking for. What ever you do, DO NOT let someone who is not a licenced reputable audio dealer/installer work on your Bimmer. Bimmer electrical systems are so sensitive and regulated that an excess of power going to a speaker system could draw power from other components thus causing them malfunction which inturn means costly visits the BMW dealership to reset certain electrical systems.