Lingenfelter L650030504 Lingenfelter 2004 GTO Airbox Instructions v3.1 - Manual (Page 4)

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Loosen the metal hose clamp that attaches the air tube to
the throttle body and remove the stock air tube from the
throttle body. Loosen the clamp that holds the tube to
the Mass Air Flow (MAF) and disconnect the stock tube
from the MAF sensor. Disconnect the MAF harness
and the air temperature sensor harness. Remove this
tube from the engine compartment completely and place
aside. Loosen hose clamps attached to MAF sensor,
remove from engine compartment. Place the sensor
aside, it will be reinstalled later.
CAUTION: Be very careful when handling the Mass
Air Flow sensor. Do not dent, puncture or otherwise
damage the Honeycell located at the air inlet end of
the MAF. Do not touch the sensing elements or allow
anything (including cleaning solvents and lubricants)
to come in contact with them. Do not drop or roughly
handle the MAF. Remove the rubber gasket, this will
not be reinstalled.
Grasp the coolant reservoir tank with two hands and
gently work it back and forth to free it from its place
under the hood. This piece does not need to be removed
from under the hood; it only needs to be moved from the
area it was occupying so that the airbox can be installed.
There is a small harness connecting to the bottom of
the tank, so don’t try to completely remove the coolant
assembly.