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I think it also comes in the grill pretty bad too.
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Isn't your radiator behind your grill

.......Its on both sides of the oil pan and usually connects to the bumper also...On my 03S its an extension of the wheel surrounds, on some cars their connected together mines one big sheet that goes from the wheel well and connects together behind the radiator and oil pan, sometimes if work was done that had to be accessed from under your car they might have been too lazy to snap all the plastic rivets/retainers back on and its left hanging open...Crawl under and check it out

it should be black plastic .... ....I think that your tires would be throwing up crap more rather then just the stuff passing under your car

...Check to see if you have a hole or a loose opening in your wheel surround...Good Luck....Radd Guy...