I've been helping a friend to resolve the issues with his 2014 M3W Brooklands exhausts. (Obviously) it had cracked in the usual place, just ahead of the offside box and needless to say was out of warranty. Standing on the shoulders of giants (thanks MarioCP, KBMOG, Planenut & others) we decided on a belt & braces approach with a flex joint and welded gussets where pipe meets the box, both fore and aft.
The work was done by Custom Chrome in Nuneaton who were friendly and efficient. We noticed that with the existing setup the rubber mounts were under tension so they added 10mm to the length of the o/s pipe so that the rubbers get an easier life. Custom Chrome have a sister company that specialises in polishing so the exhausts were gleaming when we collected them. The whole job cost £200 (for both sides) and I'm confident that the exhausts will be problem-free for many thousands of miles to come.
