I've been running a high level on my thou for a couple of years. Certainly looks different, but as I do trips abroad I need to bolt on pannier frames so have reverted to a conventional look at present. If you can find a motorbike specific exhaust guy, that's the way to go. I fabricated the mount using the pillion peg mounting points but is quite time consuming to get it right. The exhaust guy charged 125 quid including a centrestand stop.If you google Pats Motorcycle Page, there's a pic of his thou with a high level, to give you an idea.
Whizz kid sitting pretty on his two wheeled stallion.