I'm in the process of upgrading my factory 2003 EXT brakes. I'm going w/ the Baer Big Brake Kit. I have a question...for the front, do I need to purchase the one piece or the two piece rotor kit?????

whatever fit the brake kit, I'd imagine the one and 2 piece rotors are the same size. They make them 2 piece because the kits are so expensive so when your rotors need to be changed, you only have to change the outter pieces. It may be more expensive for the two piece but if you plan on having the truck for a few years, go with it.