Don't know if there is any performance benefit or otherwise? but obviously a weight saving (so a performance benefit).
Utopia has a single exhaust on his M750, I think for lightness and a 'less is more' philosophy.
Otherwise I'm pretty sure all (old) Monsters had 2 exhausts probably for aesthetic reasons? but, as above I think some of the smaller engined SS models came with a single can.
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M900, 916, LeMans II.
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