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I like them!
I made my own, I bought baffles that are for auto zoomies, not ones for bikes (larger ID tubes), I can't remember who I got them from. I mail ordered them, I'll have to look through my stuff, to find out who, and how much the baffles were.
I will make the next ones I need, they are simple. But I have been making mufflers for 2.0 to 7.3 cc motors for my R/C airplanes for years, there is few different ways to change sound waves. We have to pass a db limit for sound also.
Pat