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IMO, would agree with COcyclist.
There is not enough volume & steady pressures from the exhaust of your small-ish powerplant to greatly affect any effective gains. Plus there would be materials expense in plumbing the hot, toxic & caustic gases. Specialized fabrication and stainless steel would be required to handle that exhaust medium. Have seen complicated ideas using compressed air, supplemental turbines/fans, and even turbochargers just to blow higher gas velocities/special plenums just to prevent flow separation, vortex roll-up and hopefully to reduce drag. Jim Hall-like.
Just sculpt the optimal aft shapes integrated w/ clean belly pan. Safe exhaust outlets & terminate rear section with clean Gurney lip edges.
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