Hi, I bought a cold air intake and I went to install it and I think I did everything right, but I have a couple of questions:

Inside the airbox I found a yellow rectangular fitment on a tube. I couldn't find a place to attach it on the Air intake, so I just left it hanging after I removed the airbox.

Second question: when I rev the engine I hear a slight whisting sound. Could it be a loose seal or is that just what a CAI sound like?

ANd one more unrelated question,

When I get a header, will I need to take it to get welded, or is it just bolt on and done? thanks guys.

1)Can you take a pic of it?
2)Some CAI's make a whistling sound
3)The header will bolt on.

"yellow rectangular fitment on a tube" thats proly your AIT sensor. whisting sound is normal

"yellow rectangular fitment on a tube" thats proly your AIT sensor. whisting sound is normalThey're on the tube on the 2000 neon? On my first gen the IAT is on the intake manifold.