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One of the biggest challenges with a road car is the tradeoff between effectivness and real-world durability. In this case, the diffuser will be more effective if the vanes can all descend to within a very small distance from the ground (to trap the quasi-static pocket of low pressure air). But then they would get chipped and cracked the first time the car went up a driveway or pulled into a parking lot. My solution (and this is a HUGE dream of mine) is to have the vertical vanes be adjustible on little tracks or a bolt system, where they can be retracted for the street and lowered for the track. (The dream is to have retracting diffuser, side skirts, and airdam, with additional retracting front splitter lip.) If your guys can make any of this happen, you will have made the first *practical* *effective* aero kit for the Z, or any other car for that matter.
- John

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