the computer controls the throttle now, drive by wire. and it opens the throttle body "smoother" so its not as jerky in turn it doesn't "snap" open like the old cars would when it was just a cable between the TB your foot. A tune fixes it
really the quietest? wow i guess they wont be louder than my stingers o/h. I was under the impression they where very loud. any my stingers and o/r h has no drone at all huh