Do you poeple really think .012 is really that big of a difference. Plus I know for a fact the some of the Wing cars that get checked and pass have slugs in those spots do make them pass. I have put them in there. Bottom rails are not why DRC's win a lot of races. Look at the teams that own them. The 53, 71p, 66, 40, 32. Look at the drivers in those cars there motor programs the crews that work on them. .012 on a bottom frame rail is not going to automatically park you in victory lane and if you think so you are A. Already beat and B. Just need something to complain about.