whats the difference??

i got an 89 mazda, 2.2 head with 2.0 block, ported, polished, header 3'' to 5'' apexi exaust.... Anyways my question is this... i have 2wd sheetmetal how much wider is the 4x4 then the 2wd?????

im going to guess around an inch but where the flare stops at the top theres no difference from 2wd and 4wd