| All and every, but being realistic I would say you could slide a exhaust system, air intake system, a box of your choice and a fuel system(FASS or a pump not dual cp3's) through pretty easy at most dealerships.
__________________ 02 Red Crew Cab 2500HD, LT trim package, leather, power everything, heated mirrors, heated seats, 285 B F Goodrich AT's 90% tread,  EGR Gas slotted rotors & EGR carbon kevlar pads w/Motul fluid www.egrbrakes.com, Edge HOT Juice with a Attitude, K&N, Straight piped, Alpine mp3 deck, 15% on the windows, cold front. | 
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