
But I suspected from the beginning that this is just a Marving (which is not streetlegal and also produced in Italy) with a new label. The Marving http://i.ebayimg.com/t/MARVING-Auspuff- ... -/$_57.JPG is known for years for poor fit, lame sound and bad performance (less than stock!). But since MSR refused to tell whether its a Marving or at least provide pictures I took the chances and ordered one.
And of course it turned out to be a Marving with a new label (wouldn’t you know it


The other reason is the very tight outlet – only 17mm (EU stock 24mm)

And the fit is poor as well. The upper bolt won’t fit until you enlarge the bore-hole.

On the video the sound appears much louder, for two reasons: because of the poor fit, the manifold does not fit tight and I opened the air filter box a bit. https://www.youtube.com/watch?v=43fQkwwFohw
I told MSR about those setbacks and ask them if they could not make a GPR (they are also selling re-labeled NX650 GPR mufflers from which I heard good things) based muffler, and the answer was absolutely no and if I wasn’t satisfied I could use a drill for better performance

In conclusion, the MSR sucks big
