I recently posted about control arms causing my rear end to whine, because they are aftermarket with polyurethane bushings. My rearend is not perfect. The whine is no noticable with the stockers on. I would like to keep the steeda on because they really helped the wheel hop. I was wondering if using dynamat on the trunk floor and underneath the rear seat. Also coating the under body with sound spray. I wonder if that would really make a difference or just put the stock ones back on?