@devnull you may have been the other s550 build he mentioned. I guess he has only sold 2 for the s550 so far. Do you know if you will need to modify or fabricate anything to make the kit work?
I really want a set but I have not been keeping up with the thread. I'm hoping I will be able to get a set by the time I get ready to drive my car again in the spring.
I don't know that I've seen the 13-14 quad mufflers on an S550 but I'm pretty sure you can make them work. I don't think anyone has tried due the price of the mufflers. I think they list for 800+ just for the mufflers. You could probably due the 10-12 mufflers with a quad tip way cheaper if...
I use to have the same issue with my car if it sat in the sun for a few hours the Bluetooth would not connect or would disconnect randomly. Took it to the dealer and it has worked fine since, no idea what they did to it probably just reset it.