Technically, my first change was debadging and removing dealer logos. But because it was so basic that's not how I voted in the poll. I have a Cobb stage 1 kit on route complete with RMM, drop in filter, and AP. I'll probably also do the airbox modification while I install everything else, and possibly the sound symposer delete as well.
Up next is going to be either a Cobb intercooler or some chassis bracing.