You can make your own custom exhaust/muffler and make it as quiet and free flowing as you want. You need to make a big enough blast chamber at the entrance to catch the initial pressure without creating back pressure and use flow through baffles spaced to catch the pulse of the exhaust. If you do the proper math you should be able to make the pulse create a scavenge effect within a certain rpm range to be determined.
I started making my custom high flow low noise exhaust for my gy6 this weekend. My muffler design should give a deep smooth tone, scavenging around 5-7000rpm I should have it all welded up and mounted in a few weeks.
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