Join Date: Oct 2011
Location: Westmont, IL
Motorcycle: 2014 Yamaha FZ-09
My main guess would be the design of the bikes in general. Seeing as how you can do a left/center/right exhaust all the same. Now take the cost for bending and fitting a can, that leaves you with a left or right side as the easiest and cheapest.
Take into account from there, most final drive components favor the left side, probably from tradition and companies mimicking each other over the years. The reason the exhaust would be opposite of that is for ease of maintenance, minimum interference of other parts, ease of dismantling and refitting.
I think it is purely a design that came about, and people stuck with.
Some things you can prove. Some things you need faith. You can't prove that gravity exists but still feel it's pull..
I would strongly suggest wearing a pair of pants that has no bottoms in the pockets. This way, you can scratch your nuts in church while still appearing to be a classy guy.