Lingenfelter L650060505 Lingenfelter Pontiac GTO Air Intake 2005-2006 v4.0b - Manual (Page 7)

Step 16 - If your vehicle has a wiring harness as shown in
the image, use a fork type pry tool or equivalent to free
the wiring harness from the vertical radiator support
beam. The airbox will rest against the support beam at
this location.
Step 17 - Now install the box by tilting the front down-
ward while moving it towards the front of the car.
Step 18 - Make sure this harness routes to the inside of
the airbox as shown.
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Step 19 - The Torx head will push into the grommet on
the inside of the fenderwell.
After the front section is in position, work the rear down
onto the fenderwell and push the Torx stud firmly into
the grommet on the inner fender wall.