Lingenfelter L650030504 Lingenfelter 2004 GTO Airbox Instructions v3.1 - Manual (Page 6)

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Install the black “L” bracket as shown. The
M5 button head screws with washers should
be installed from the outside of the box, using
the predrilled holes and the nylock nuts without
washers on the inside. The “L” bracket with the
offset also mounts on the inside of the box, fasten
in the manner explained above.
Install the rubber seal pieces on the large radius section
and on the bottom section of the box. Be sure that the
pieces are pushed as far as possible. Now install the box
by tilting the front downward while moving it towards
the from of the car.
Located the 3 ½ Inch tube with the flange welded to
it. Push it through from the outside of the air box. The
weld should be hidden by the plastic box. Insert 4
button head screws from the front side. Locate the large
flange with the 3 5/8” Inch hole as shown. Slide it over
the tube from the backside of the air box. Secure with 4
nylock nuts as shown.
The smooth rounded side of the new air box piece will
be referred to as the backside. The front side is the side
that faces the engine.