Of course it devalues the car, UNLESS the buyer is looking for a toad. For anyone else, it is an unknown at best, and a serious fault at worst.
ANY mechanical modifications generally devalue a car, unless they are a mod the the buyer is specifically interested in. For example, a racing clutch. Great if you are a racer, definitely bad if you are not.
Marc and Jill, Wellington FL
2013 Entegra Anthem 44SL