What is this piece?

[Champion1216]

I noticed this small pipe, right under the CAI filter was leaking, I’m not exactly sure what it is but it’s probably not good. Also, the exhaust smokes rarely on a warm day after 20-30 mins of driving, and it only smokes when on acceleration, any idea?

 

[wmburns]

It appears to me that you are pointing at one of the AC lines.

Note, If you are hearing a hissing sound this is normal sound of Liquid Freon boiling off.