Sienna mentioned on the S4 engine pull thread that the DMF can cause drivetrain shunt. My S4 has a little bit of "shunt", but I dont know if this is caused by the DMF. Is there an easy way to tell if this is the DMF? How would this feel to drive, as opposed to, say, worn engine mounts? How much would I be looking at to get the DMF changed, parts & labour? If replacing this, should I get anything else done?