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I have the OEM SI lip on my 99, I scrape all the time if I don't take my driveway at a sharp angle, or with 2+ people in the car. Like was said, it's all underneath so you can't see it.
I've had the lip 14 months and the only visible damage is rock chipping. If it gets worse, I'm just going to sand, bondo, primer and paint it again like I did when I got it -- no worries here.