Up front I didn't read all of the posts but I always thought all of the cars got the wheel well "sound deadening" for gravel, stones, even to dampen noise from wet or snowy roads and it was NOT undercoating? It seems the same "sound deadening" was used inside the trunk, inside the doors and even inside on the floor pan. I also thought that "rust prevention" undercoating was done by the dealer or someone like Ziebart, etc., Was there a option code for factory rust prevention or was it extra sound deadening?