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I kind of disagree. If we consider the highest possible flow engines out there steam turbines and jet engines they are all as straight as they can get them. I've toured a couple of power plants(Kingston/Erwin) and their steam piping coming towards the turbine is smooth and straight as is the "exhaust." Yes of course they have to curve some but if you look at most turboshaft engines that exhaust just curves enough to get the driveshaft out of the piping and thats it.
Yes obviously there are also huge gains to be had from making the pipes the exact same length but you can do both.
just consider a single cylinder engine. Best you can do is get it straight and smooth. Go look at engine exhausts that are single cylinder. It curves to get it facing the right direction and that is it, no other curves. two cylinders is the same for bikes, curves 180 degrees to go under and out no other curves(except maybe for styling to get it to go under the seat). Speed Triples are the same and the L4's that I know of do it as well.
You can get nearly straight and have equal lengths. We all agree that straighter smoother is better, and we all agree that making sure the engine scavenging and harmonics work out. So we all agree that a system that is as smooth and straight as possible while maintaining equal lengths is best.
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