Heh, good question, I don't think I've ever read of anyone starting to modify their car that early.
My argument would be, yes, I'd wait for a while. My reasoning would be if something is faulty from the factory it may not have had enough time to fail yet. Once you modify the car and loose the warranty, it won't be covered if it breaks. God knows we've had quite a few '09+ engine failures, a guy I know locally had his '09 FXT's engine blow up at 25K+.
Stan