Mine was received by the dealer last Monday and I took the F31 in on Friday. It is supposed to be a 1 hour job however there was a problem with the clamping bush and the car was only ready today.
Apparently the kit they received from the factory had a 65mm clamping bush instead of the 75mm that was supposed to come with the MPE kit.
Had to wait for a overnight shipment and got the car this morning.
Since they were the ones that brought the car to me, I only drove it 200 meters into the garage. The sound difference for the stock exhaust is clear. I'll now let it break in and then post additional remarks.
For now where is a picture:
