Since I am old enough to remember road draft tubes, I called those memory cells up.....

when you looked at the running car from the front, you could see a little "smoke" coming out from underneath and behind the crossmember

the underside never rusted because of the oil film from the tube exit and back to the rear axle

when you pulled the intake, there was a Valdeze sized tar blob at the back of the lifter galley

the horsehair filter in the road draft system was a bear to clean, you could flush it for a week and still get oil coming out of it

it seems that the end of the tube was cut at an angle and always dripped on your forehead when you were under the car

mike in tucson