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On my 98 vert, 05 vert and 07 Z06 the airdam does scrape a bit on my gravel driveway& a few dips here and there. The dam is designed to take it and if you do a MAJOR NO NO its easy and cheap to fix.
My didn't take it they looked ugly after to many scrapes,so i I dumped them in the trash seven years ago...They do nothing as GM designed them to do...