Have you seen this?
http://www.pro-touring.com/showthrea...t=aerodynamics
The undertray, spoiler, bonnet vent is a similar issue he had with an old Maxima turbo, no flow across the intercooler and making the radiator work harder.
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'66 Bus(11-window, CLK rims, disk brakes, IRS, bags, hydr. clutch, Super-1600 w/injection)
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