I was taking off my header last night and noticed there was a black hose that was not connected to anything. It sits right next to the header when your under the car. Is this supposed to be attached to something?

 

Picture might help.

 

only things I can think of are heater hoses and O2 sensor lines.

 

That is the AC drain...you mean the one pointing downward yes?

 

It's the A/C evaporator drain, don't plug it unless you want water inside your car.

 

Ah, I see, yes it's pointing down. Thanks!

 

hah. you two are too good at remember S2K parts. I had to unclog my drain so I should've known it was that.