The pieces that the arms go into to hold down the sunroof. I need the damn thing to stay down at 55 mph. I also need the stock muffler to quiet down the car. Willing to trade whatever this racing muffler is for it. PO installed it and I don't have documentation, but it's loud, drones on every takeoff and when accelerating and I feel like I'm waking up every neighbor as I drive down the street at night.