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"We also studied the airflow beneath the car, especially the underfloor area, to get the engine heat out. We evaluated a variety of underbody trays, some even covering the rear suspension, catalytic converters and fuel tank. But we found that the velocity of the air traveling under the rear of the body was not very great, so these covers were not helpful in reducing Cx. They had a slight benefit, but the trade-offs were very high. The final production version does have panels directing the heat flow up front, and these are very important, because air velocity near the front of the car is high." ^^ As quoted by a Nissan engineer. I'd focus my efforts on other easier aspects, and not worry about underbody lift/turbulence until you're running out of more conventional, and less destructive ideas. Replacing the seats with lighter, non-adjustable models will save you as much or more weight than your trunk mod, IMO. And that's just one thing.
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