AM just released a few different grills for the 2013.
http://www.americanmuscle.com/2010-mustang-grilles.html
I like the look of the black billet one. has the look of the Roush but its metal instead of plastic. On top of that it says you can keep your stock fogs and mount them behind the grill. only thing i dont like is the lower grill is just an overlay over the stock. for only $189 for both I might have to give it a try. I figure I can cut out the stock lower where its not needed to mount the billet one one. what do yall think?