Its terrible (the rock chips.)
Though, and no offense here, I can't seem to gain any positive opinion on your concept. I like it on a white 1985 911, but for some reason, it just doesn't fit on my X.
What I should've done in the first place was to install a clear guard...but alas, I'm an impatient person and never set it up before driving like a maniac and getting it chipped up.

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