the rear slits are to allow air to escape. you'll see stuff like it on aftermarket rice bumpers and on most exotics you will just find empty space, not even a slit.
without them, air carried under the car gets trapped in the rear bumber and creates a certain degree of drag, the slits allow that air to escape.
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-Tim-
~I swear sometimes i feel like i'm married to a child.
~You better watch who you're calling a child, Lois, cause if i'm a child than you know what that makes you? a pedophile. and i'll be damned if i'm going to stand here and be lectured by a pervert.
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