I am looking for suggestions for my 79 300 exhaust system to reduce the sound and vibration my current "Flow Through" system is causing. As many of you know my wife suffers from a debiltating nerve injury to her leg that reacts terribly to loud noises or vibration which has prevented her from going for a ride with me. She can tell when a train is 10 miles away just from the vibrations in our house. I do want something that will sing the song of our people when I step on it but is quiet at idle and under highway cruise. No drone etc. Flowmasters? Magnaflow? What have you used that didn't shake the windows but sounds good under full throttle?