It's the hose/tube that runs from the air intake to the exhaust manifold. I'm missing it and don't know what part name to look for.



thanks.

 

Google "heat riser hose", and you'll find what you're looking for. It's purpose is to heat up incoming air until the flapper valve in the snorkel closes. But, if you're not driving the car in cold weather, you can let the hose remain missing.