I get that too!! I've noticed during heavy rain or something, the vibrating is annoying to be fair, but in a good way hahaTyperItr said:Well i bought mine second hand off a member on here so i dono where to get them from normallly. I dont know if this is normal or not, But if i go through a pubble and it splashes the exhaust, the exhaust then gets louder and viberates And between 5-6 k revs there is a tinny noise off it haha. I dono if thats good or not????? O well.