Removing the old filter box

Detail of the original air box.


Using the large image as a reference you need to first remove all the clips from around the edge of the box, then use a phillips or crosshead screwdriver to undo the pipe clamps on the large intake tube. The solenoid mounted on the side of the airbox should be left connected to its wiring and larger two tubes, although it must be unclipped from the air filter housing. At this stage the MAF sensor should be left in its mounting position and the wiring connector unclipped.



Air box cover removed.

Once you have removed the airbox lid this is what you should see.



Remove the air filter.



Undo and remove the two bolts holding the airbox in place. One is to the left the other is in the front slam panel.



Turn the airbox over and you will see another valve with three small bore pipes attached. One of them should go to the engine, the other two connect to the airbox itself. Undo the blue cabling connector and also disconnect the pipe that goes to the engine. At this point you should use the short rubber bung supplied in the kit to cover the outlet on the engine. Leave the valve connected to the airbox, you won't be needing it.



You can now remove the old airbox.



And the old air intake pipe.

Source...
http://www.celica-club.co.uk/pages/modifications/performance/blitz_intake/remove_old_box.htm