The
vents are for high speed stability. They don't really line up with the brakes; but rather, the air flows around the wheels and escapes through the rear vent and along the body. Plugging these is fine in slow speed winter driving. But don't leave them plugged if you are going to go FAST. That's just messing with the design; which, I am confident in saying, is well thought out by Biermann, et al. If the
vents don't "vent", then high pressure will build up where it was not intended; to what potential detriment, I, for one, will not experiment to find out.