Had a custom cord made for my STi that included a mute button (no big module) and an LED to give a notification if music was loud. My only issue I had in the past was that the two suction cups could be very easily seen from outside (even from a short distance). I tried to paint them and you could still see them from the outside. I had a small tint line put in across the top of my windshield (5%) and voila! Problem solved. What do you think?