i've got the racing super medallion....don't know if theres much of a difference between that and the regular racing medallion but the only problem i've had with the silencer was that the first time i put it in i must not have tightened the bolts down enough and the damn thing shot right out on the street as i was driving. It sounded good while it lasted, now i have to go buy some new bolts and hope that they can hold..but i didn't get any vibrating either.