After driving my GT 2300 miles over some really nasty roads, I am happy to report the bottom of the car looks perfect. I did use Rich’s screens and 1 layer of PPF of the door bottoms, that’s it. I think the rock chatter under the car sounds way worse than what it really is. I don’t see a need to change tires and lose a ton of performance. Drive the car at 55 degrees and notice the reduction in traction, that’s basically where you’ll be at best even with just a Michelin Pilot Sport 4S, but that’s not even an option.