Yup, a lot of folks with DYI racecars round here do the same. Smooth upward sloping and straight fins. The other DIY is a front splitter...all you gotta do is make sure its flat and well supported and it will help direct air more smoothly under the front end again creating stable faster flowing zones underneath that help with front end stability. The coup de gras being a fully flat pannel under the middle section of the car connecting the rear diffuser and the front splitter. BANG, tons of downforce and no giant wings ala the F430 and 458 Italia.
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