Challenge grill? What is it good for? Absolutely nothing! Say it again!
Now, it can look good only on Nero F430, IMO. I saw it few days ago on Giallo car and ask fellow Ferrarist why? You know what he said? "It was my dealers recommendation because it is lighter then standard one and it look sporty!"
BTW, this guy is playboy kind of person(you know what I mean, Gold chains, hairy chest, my wife said "FUI" to me!) so... For me Challenge grill is a big NO, NO on F430. It simply destroys rear lines, IMO.