looks like i lost mine during the header swap. Its the small hose going from the side of the EGR tube (right under the valve) and hooks to the bottom of the transducer in the back of the plenum. I remember it wasnt just an average rubber hose...if I recall correctly it was like two types of rubber....im assuming thats needed to withstand the hot exhaust gases. Any info on what to ask about when I go get a replacement? Thanks!