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I do wonder if some (small) gain in reduced pressure drag might be achieve by directing the exhaust flow on a road car though.
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I try not to think about that. Because exhaust gasses are hot and corrosive. I have centrifugal-pumped engine cooling air to work with though.
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Lose the pumping loss and bump up the compression (ethanol, methanol or CNG?) and the SI engine will be more efficient than CI.
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A Revolutionary Split-Cycle Design | Scuderi Engine
From their Engine Performance Data pdf:
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1,400 RPM – Maximum Load
Brake Mean Effective Pressure [bar] — 9.3
Brake Specific Fuel Consumption (g/kW.hr) — 269
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with equal sized cylinders. Mismatched cylinder displacement and 3.2 bar of 'Constant Knock Margin – 40% Turbo Efficiency' gains 13.4% on those figures.