I had the ZL1 Addon rock guards, still got a TON of rocks hitting in front of the rear wheel.
Luckily, I put on PPF when the car was new, now after 1 year and 9000 miles the PPF is in really bad shape. I just replaced the PPF and installed ACS side skirts and front rock guards, but what I'm going to do in addition is put a patch of matte-PPF over the regular PPF just in front of the rear wheels so it has a double-layer and the damage to the PPF won't be as noticeable since it's matte.
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