[ERinEC]

I just dropped my car off at a muffler shop to have this installed on my 2011 E92 M3. The shop is claiming that the bracket used for the OEM x-pipe is tack welded and must be removed, sanded slightly, and then welded back on to accommodate the Challenge.

It was my understanding that the Challenge x-pipe is a direct bolt on to the rear OEM muffler section.