i had an aerox.
i swear there is no fixing that problem without loosing performance. i repacked my farbizi pipe like 5 times. still loud, way too loud. even with different filters it didnt like to be quite. smaller carb quietened it, but who wants a smaller carb... i tryed a lot to get it quiet, i even placed a whole new silencor on, whitch was thicker. still loud, maybe droped by 5.
the only other thing i could think of was wrapping the downpipe to dampen the sounds. didnt try it, sold it first lol... also the heat wrap stuff would draw heat from the downpipe. i hear you want your downpipe on a 2-stroke to stay very hot, so maybe not a good idea.