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I need to figure out something for that dead zone at the rear of our van.. since removing the spare tire from under the van, there's this large space under the rear.. I had planned on installing a better exhaust and some sort of rear defuser system. Doubt I'd drill holes in the rear bumper cover, but could just trim off the lower edge of the bumper cover.
my prob is that with the addition of the 19'' wheels and 245/40 tires the van is up higher that stock.. I don't want to lower it anymore, but may need to use side skirts etc to reduce the negative air flow under the van.
Ideally, if I could do it again to make the wheels more aerodynamic is to go with a 42 offset instead of a 40 offset.. but that's extremely tight.
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