Dual exhausts on a stovebolt are like dual carbs- - - -eye candy for people who are lousy at physics. There's no point in having huge links in a chain that's held together by a few loops of baling wire in the middle- - - -the cylinder head!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!