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Originally Posted by markweatherill
Is there enough exhaust gas to make a difference in a car's aerodynamics?
Would pointing the tailpipe in a particular direction have an effect?
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Exhaust gases are corrosive. IMHO best to just get them away from the car. A VW beetle has about 1500cf/m of exhaust and 1500cf/m of pumped engine cooling air. My thought was to boat-tail the car and then inject the engine cooling air into the truncated boat-tail. It would look like this (on the left):
The actual vent is designed as a Coanda nozzle.