The only thing I can think of is that it is opposite the kickstand. Is there another reason ??
Cause on a 'Busa, it'd NEVER be allowed to exit on the WRONG side.Is there another reason ??
What is on the left side where the pipe would be....A moving CHAIN. Hard to tuck a single side exhaust in close to the bike with the rotating saw The arm on the left has the perfect spot for single tube exhaust. Dual exhaust on the left side is further out to get around the chain and arm.
they appear to be pretty balanced on the stock busa pipe.
But when you have pulled a factory system have you ever noticed the big dent in the left hand mid pipe for chain clearance, that must affect flow somewhat.