Thanks Dreamer. It was when this picture was taken but since found out (via the magic of a Clapham pothole) that the box-to-xpipe flange was on its way out. Since had a specialist fabricator replace both sides with bespoke solution (a thread I'll be posting soon with pictures).Dreamer said:Is your left exhaust box low? Looks like the mount might need replacing from the pic
Edit - also per Bing's response! (Thanks Bing!)
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