Quote:
Originally Posted by SvdM
With the side-skirts added however, you might actually have helped create a much lower pressure [and bigger vacuum area] at the back than it would normally be and this actually put you back to square one [kind of].
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From reading here and elsewhere, there is a sideways flow coming out from under the car - and wheel boattails or deflectors should be shaped accordingly.
The sideskirts may be preventing that sideways flow from happening when they're too low, forcing all the air under the dirty rear underside