Introducing the Stock Airbox Conversion Kit for the TGK Motorsport Audi 4.0T Air Intake System. Specifically designed to seamlessly connect the TGK Motorsport 4.0T Inlet to the original C7 Airbox, this kit incorporates an OEM RS7 Filter. The Locking Collar utilizes a Billet aluminum locking ring, which snaps into the factory airbox, just like the factory piece.  It is important to note that it is not compatible with the factory S6/S7 Filter due to the smaller filter inlet size of the S6/S7 Filter. This conversion kit is ideal for individuals who have already acquired our intake system and wish to transform it into a closed airbox setup. Additionally, it proves to be an excellent choice for those undertaking a single turbo conversion on their 4.0T and desire to retain the factory airbox.