Found the source of the rattle to be wire looms under the passenger seat by the center console. I put in a 1.5 inch wide sponge material and it silenced it. My previous attempt to place sound deadening material on the console didn't work.
I don't have it, and it's just right. Less switching mode to distract from driving. On interstate speed the regular exhaust sounds good -- not too loud or not too quiet, just let you know you have the 5.0 exhaust note everyone wished they had.
You can order the spare tire kit from a Ford dealer parts department and it will be 60% of the price of sticker option and it will come with a jack and lug wrench.