I am currently working on cleaning up my engine bay as much as I can and deleting everything that can be deleted. The question is what is the hose that runs from plenum to battery compartment? Also can this hose be deleted as I see many nice engine bays with the hole in the plenum plugged and the hose gone.

Any info will help

 

brake booster. Dont delete completely.

Reroute it.

I have a cosworth plenum. It relocates that hose to under the TB. I ran it to the brake booster through the false firewall.

 

Thanks for the info!