air box
The intake tube enter the fender from where you see in the engine bay. Makes a turn towards the front and extends about a foot and just ends. The opening is slightly flanged and is just about right behind the turn signal. There is also a resonator or silencer tube attached in there. A really poor setup but a great place to start for a cold ram air intake set up.
I noticed that at the end of your post you listed a turbo as your future mod. My suggestion..... Don't do it. Way too may things to change. The $$$$$$ you will have to put into a DX or LX to turbocharge are much better spent in selling you DX and looking for a GT.
Sorry and Good Luck!!