So I purchased some cheap mirrors which came with cap head bolts. The clutch side mirror bolted on just fine but I found out the throttle side was reverse / left hand thread but both bolts I was supplied with were standard thread.
I can't find a supplier of reverse thread cap bolts anywhere...
I was going to have one map for use with baffles and one map setup for riding without baffles but dam there just too loud without the baffles installed!
So I plan on following Dynojets advice and editing my performance map by reducing the fuel at cruising range by 10%. I can then use this...