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Ive read in the aerodynamics part of the forums, that the area behind the cabin is a low pressure zone and therefore the stock spoilers offer little to no benefit without being in the main airstream and would thusly need to be atleast as tall as the roof line is.
Madpsi.net makes a neat little lip you can add to your roof line that they claim offers some downforce benefit, without having to put a huge tacky wing on your car.
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