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Unless the fabric is quite taut, it will flap in the breeze. I don't think that will be good for aerodynamics.
Exhaust air is hot. Hot enough to melt plastic tarps, right by the tailpipe. It also has a lot of water in it. An aquaintance of mine once used his car's exhaust to inflate an enclosed balloon, trying to get it to float because of the "hot air" going in. It actually sat up a ways, and then the car's engine died. The water in the exhaust had condensed in the balloon, and come back to the tailpipe of the car, choking the engine and killing it.
(I hope he wasn't just pulling my leg with that story, but someone else backed him up on it...)
-soD
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