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Some where on here is a topic about injecting air into the wake of a semi truck. They talk about seeing decent results with 1/4 psi (compared to what, I don't know). They used compressed air to evaluate results & were working on how to produce the air efficently afterwards. So the idea has some validity.
Something to consider is that a turbo charger will quiet the engine down to a degree. You may be able to reduce restriction in the muffler & maintain the exhaust backpressure that helps the engine run at low RPM. Like Zerohour suggested, ducting the air to a shape near the outer perimiter of the back of the car makes sense to me as well. What makes sense doesn't always work though.
Don
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