Exhaust may get nothing but they do sound good.
Hit up 5 Star tuning he does wonders for the V10's
Do the Y-Pipe mod. It will open the exhaust up. Did it on my 02 Excursion and helped a lot with power, sound an fuel mileage. Changes the chintzy 1 1/2 in T after the cats to a true 3 inch Y-Pipe. Got it on ebay for about $80 and welded it in.