I pulled my mudflaps off earlier this summer because I was missing one and I'm not really a fan of how they look anyway, and behind every one of them, there was a bunch of crap, and some rust starting. Today I pulled off the silver trim that runs along the bottom of the car, and the same thing was happening. Every major rust spot on my truck started behind either the mud flaps or this trim. It's kind of annoying, particularly since it seems to look better without them anyway.