Exhaust gasses, like water and electricity, takes the easiest route
Starting from the top, four pipes, go in to the collector, two on top two on the bottom
All are joined in the collector.
Two outlets from the collector, one goes straight into a silencer ( the right one ) and the the other ( and this is the important bit ) comes out the collecctor box into a 90 degree bend to the left, across the bike , into a 99 degree bend to the left and finally in to the left hand silencer.
So not only does the gas have to negotiate two right angle bands but has further to travel.
Hence, the right one smokes when it’s cold and as a matter of interest, the left one runs cooler
