Thanks for the pic. That is pretty darn close to what I was thinking of doing with my bumper actually. I was thinking of adding a vent for the radiator in the front radiused section of the underbody panel. In any case, I think I'll use the EV-1 as a template.
I'll have to look at Hucho's book. I haven't been reading it much lately and am only on chapter 4. But, I believe he said something like 2-4" when he was describing the VW bus. I remember the section, just not the exact number.
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