Ceci , the problem you are up against is that 180* firing parallel twins with a single pipe are a weird anomaly used in restricted classes of Jetskis and Snowmobiles for packaging/ space/cost reasons only.
Nothing to do with efficiency or power.
The bottom line is that twin pipes make way, way more power and do that with alot less Exhaust port timing needed for the Y and single pipe setup.
They also allow a parallel twin to be run in the " big bang " 90* firing configuration , albeit then needing a balance shaft.
The cut piston skirt idea I developed just as a cheat of the rules to win a world title , it worked , but I can see no other reason to be looking into it as an on going project with some worthwhile end goal.
Those cut pistons also had a ceramic coating ( illegal as well ) equal to 50% of the inner dome area , and once they had been run hard , they colored up in the middle thus camouflaging the coatings existence.
That idea of ceramic coating just the pistons combustion chamber area ( and the chamber itself ) , but not the squishband , does have an application in any 2T race engine , as it reduces the thermal load on the piston - and
the heat rejected into the water cooling system.
Take that idea and you can use it anywhere , as its a guaranteed way of being able to run leaner and make more power.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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