Auto Union used their current F1 car of 1937 to hang the streamlined aluminum on. The Type C Grand Prix car of 1937 had the exhaust headers curl out from under the cylinder heads at 180 degrees (or so) and exit the bodywork up and out without being routed through pipes as the other Grand Prix cars at the time. The main reason for this was that the engine was behind the driver and the exhaust gases being inhaled by the driver were of no concern unlike the front engined cars which needed to route the exhaust behind the driver.
When Auto Union streamlined the Type C (V16) the engine and chassis configuration weren't changed just the bodywork. The cars were never raced. After the death of Bernd Rosemeyer during a speed test at Avus (I think) the streamlined Type C was halted.
Below is a picture of the unstreamlined Type C and a "cut-away" of a Type D (V12) showing the exhaust pipes exiting the bodywork right in front of the rear wheels.
And if those were intakes, there better be a screen over the openings or there's gonna be a lot of dirt and maybe even a bird or two sucked in to those 16 cylinders.
I'm getting butterflys. 
Oh well.![[empty space]](/forum/data/avatars/m/47/47550.jpg?1277426423){kind=avatar}
