i have civic ex 04 i installed the intake already but i only used one of the 2 tube...the reason is, if i used both, it wouldnt fit or i couldnt get it to fit...wat im asking is, where does the air filter go and how do i get it there

 

It goes where the stock intake box is.

 

If your asking that you shouldnt be doing it.

 

it probably goes down into the bumper. not sure though on the 04. sorry that isnt much help.