These include a rubber seal that seals the extensions to the ram air tube that extends thru the frame. One look at the factory setup and you can see that it doesn't seal properly. Comes with instructions. Fits all years up to 2008 models. $95.00 shipped within the U.S
To install the Ramair mod you will need to do the following modification to your Airbox:
Remove the Airbox and carefully grind off both sides of the foam and the raised lip on the end of the air inlets on the airbox. Once that is done make sure the sleeves slide over smoothly. Apply Permatex Silicone to the beginning and the outside (not the inside where the airflows) and slide the sleeves into the air inlet tubes. Reapply the airbox and tighten it down. once that is done slide the sleeves towards the frame until it touches the frame and align them so that they are flush. Let the Permatex dry as directed. Once the Permatex has dried roll the rubber seals so that the gap is covered, use a screwdriver to roll the bottom on the rubber seals.