Hi Stan, thanks for sharing your experience. I have been addvised that "my" exhausts have arrived and so my M3W is going to the workshop this week. The parts needed to fit them have been delivered a month ago, and thankfully we were able to look through them. Of course some needed parts were missing, the new stiffener panels should be 4 (2 per side) and only 2 were in the box. My dealer asked for the missing parts and I do hope the other 2 panels came within the exhausts package, but we'll see ... and nobody in the workshop had any information on a supposed ECU flash to be performed alonside the fitting of the new exhaust system. I'll hold any comments about it all. In fact, I don't think they're needed.
(this reminded me a "funny" story. During 2015 I asked for the taller roll hoops with padding. Since I was going to Shelsley Walsh Thrill on the Hill I arranged for the roll hoops to be delivered personally to me there. All agreed, when I got there the guy from Aero Racing had ONE roll hoop for me.

I didn't bring it home, and asked for the full set to be sent by mail to Portugal. It arrived, can't remember how much time later ... and this time TWO roll hoops were in the package. But ... they were both for the left side of the M3W. Even if one of them could be mounted on the other side, it would have to be mounted facing backwards, wich meant the padding wouldn't be correctly positioned in that one. When another roll hoop was asked (of the right side configuration), my dealer got a reply saying that with some washers added we would be able to fit the padding in a correct position, similar to the other one. That's when I finally gave up.)