The 2 cycle H.T. China girl can be quite loud especially with the expansion chamber. Do you guys wear earplugs (i do) and what kind ? Right now iam wearing a pink foam flat on both ends and circular--but they dont seem as good as some solid rubber ones i had flat one side and rounded the other. I dont think the ear muff style would work too good with a helmet ! i feel you still need to hear somewhat. They can sometimes be hard to set well.