Manifold/header/muffler/tail Pipe problems of the 2010 BMW X6

Tl the contact owns a 2010 BMW X6. Shortly after purchasing the vehicle from a private owner, the contact stated that excessive smoke came out of the tail pipe and he discovered service bulletin number: 110815. The vehicle was serviced by bill jacobs BMW (630-357-1200, located at 2495 aurora Ave, naperville, IL 60540), but the contact was uncertain if the vehicle was serviced by a recall and if the valve stems had been replaced. The contact stated that the rear of the vehicle was smoking excessively and there was a reduction in power. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failures and the contact was waiting for a response to determine a repair remedy. The failure mileage was not available.