Lingenfelter L650030504 Lingenfelter 2004 GTO Airbox Instructions v3.1 - Manual (Page 5)

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In the void where the air box was, you will see a
fastener with a T-30 Torx head, remove this fastener.
The stock air box will unfasten in a manner similar to the coolant reservoir. Remove the air box and the
section of black plastic that mated up to the airbox and the headlight housing. Tilt the top of this piece
toward the back of the car to remove piece more easily.
Remove the rubber grommet that is on the mounting
arm located on the bottom of the stock air box. Install
the grommet as pictured, using the factory hole on
the upper portion of the inner fender. Now install the
fastener, torx head first, into the grommet, this will serve
as a mounting stud for the air box.