I have a stock airbox. I believe I understand where all the hoses on the backside go. However, the port on the right side of the box which has a hose that goes downward and under the airbox doesn't seem to be connected to anything. Is mine wrong? What is the purpose of this output?

 

It's been a while since I looked at where that one went on a stock set-up, but: pre-cat? Do you have a downpipe on it?

 

That is normal, search on that one. That is the vent for the waste air for the air pump. You are all good.

Dale

 

thank you.