I've been complaining about a loss of power and quiet exaust sound. Yesterday I ripped out the factory " cold air duct", That is a must for any contour with a cone filter. Then we put a dmd on with a new belt, also i needed a new idler pulley. All said and done my car is felling like a champ right now with a couple of adjustments. Oh yea the dmd is the best mod i've done so far!