Uhhh... where are you looking?
There's only a handful of mods you can do to a 5.0L.
Air intake, throttle body, upper intake, lower intake, intake spacer, cam, rockers, headers, coil packs, plugs and wires, exhaust, stroker kits, programmer, gears, shift kits... and on and on and on.
Did you try searching this site before posting?