Just got my hearing done & came back with a slight decline in my right ear @ the 8k/35 cycle range. I've noticed that while I'm driving in the vert there seems to be a harmonic echo near the right rear area of the car. Can't say if that's the cause of my loss or I'm just now more attuned to it but has anyone else noticed this? Maybe smelling to much exhaustThe easy solution of corse is to Dynamat the whole car, lead it & viola I have a lead sled. Any recommendations?