hey one more thing sticking in my head... I head a world-known PhD in aerodynamics look at my car believe it or not about 1 year ago... he told me to try and minimize the boundary gap coming off the rear deck and keep it attached so that it would join the air coming off the diffuser... he said it would make the diffuser more effective... obviously runs counter to the car as upside down wing theory, but I remember he was adamant about it... brain hurts!
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