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slownugly, Look at the diffusers under F1 cars to get an idea of how small they can be and still be very effective. The important aspects are; fences on the sides, roof has to face the ground, angle of the roof 3*-5*. If you can find wind tunnel tests, it's amazing how the diffuser under the bottom changes the air flow over the wing on top. Belly pan vs. no pan, are you headed to Bonneville? Get a vacuum gauge and learn to use your right foot first.
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