Quote Originally Posted by Sal-XK View Post
Just while moving and mostly noticeable when at least over 40MPH. If I let off the throttle it goes away. I'm the only one that can here by the way LOL My wife think I'm crazy and being OCD over it.
Mine does the same thing. Right at 40mph there's a hum, but it is directly in proportion to throttle, like it's the motor. I am assuming from posts of those who have added aftermarket exhaust to the MDS hemi that say the motor is actually louder on 4 cylinders than 8 that it's the MDS system coming on. ?? Maybe someone who knows more about that can shed some light on it. But as far as I've read, 40mph is around where the MDS is supposed to engage