Saturn did a rear diffuser. When Andy fitted it to his demonstrator he said the results were very good.
the diffuser would act like an aerofoil but if anything you would get downforce and not lift.
They also look good and finish the rear of the car nicely.
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Click to see my build photos on Flikr
http://www.flickr.com/photos/67112582@N03/
Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.
Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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