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i have to say BMW for the win and rear diffusers are the bees knees if used correctly.
joking aside i am doing similar things to my 94 530i and 96 vw cabrio. cabby needs it since its not lowered. my bimmer is lowered almost 2 inches in front and 1.5 in back. has a slight rake which creates a low pressure area in the mid-rear area. with belly pans and a diffuser it would get really good downforce at highway speed (good during passing semi-trucks and turbulent windstorms) and less air under car = lower Cd.
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