You keep saying MDS light. Does 14 have a seperate light that says MDS or 4 cylinder as well as a ECO? Or just ECO?So we'd agree that the MDS light will come on when in 4 cylinder mode (and you state it also comes on when getting better mph). Regardless, it use to go into MDS mode when using the accelerator to maintain speed. Now it will only come on when removing all pressure from the accelerator. The only thing I've changed is the mufflers. It was working that way an hour before install and the next day it was not working that way.