I wanted to retain the factory air box, cause I made a water trap in it. just a plate with a sponge under it. I used 3" pipe for the snorkel. and I have some honda parts laying around. I used the intake pipe off a 1.5L and the adapter for those gay ass 'cold air intake' jobs. its the red thing. The black pipe fit into the existing hole of the air box, its like it was made for it. then for good measure I silicon'd the joint.