I agree with Mack on all points especially that China mufflers seem to be overly packed. I noticed having a fully packed silencer just doesnt dampen the sound too much as the exhaust just doesnt have room to go through the muffler canister. I reduced the packing - noticed some improvement in the overall engine powerband (but very slightly dropped top speed). Went on to the old trick of scrapping the original stuffing altogether for dishwashing steel wool and packed loosely. Result was a lower and quieter tone. I guess what I'm saying is you can play around till you get noise/tone/effect on power that you prefer.