maybe this type of pipe could have the outlet aimed at the chain to keep it lubed
Now there's an idea!
To answer your questions; I've not ridden it much so far in this configuration, as there is still a small amount of work left to do before registering. However, the silencer exit is angled slightly away from the bike and is below the level of the foot rest, so no smoke in the face and I don't expect any unburnt fuel-oil mixture on the left boot or rear tyre. Still, these are aspects I will be watching out for when the bike gets on the road. Whether it blows any dust remains to be seen - if it does, I might be able to use the bike for clearing the footpath outside the house as well
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Regards,
James