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Hi Christ,
Some of this was discussed in another thread. There as a link to an article in that thread. The researchers found that unless the thrust was applied to all 4 edges at the rear of the vehicle at balanced levels, drag was increased. I think some kinda air-amplifier technique might do something. An air amplifier uses the pressure in a gas to pump massive volumes (in comparison to the air volume under pressure) of ambient air. Industrial Air Amplfiiers are designed for typical shop-air pressures - 80 to 125 PSI, however. One designed for the common back pressures in an a car exhaust would require the engineering background of the original designs.
Tebuchet, its not the volumes that needs to be compared, but the masses of gases. :-). The gas in the exhaust is under pressure, so its density is more.
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