like the title says which one is bigger, are they the same> have you tried 89 mesh prelude rims on your ef? do they fit?

 

the ex sedans have bigger rotors and calipers and need, i think, 14's or bigger. may be 15

 

any one else??

 

the EF wagon brakes are DX knuckles which use 9.4" rotors. the EF 90-91 civic EX 4-door sedan uses a bigger caliper w/ 10.3" rotors.

if you plan on using 90-91 civic EX brakes, you'll need to swap the knuckles, the EX calipers won't bolt-on to the DX knuckles.

with the bigger EX calipers, you'll need more fluid to push the piston. upgrade to a 15/16" 90-91 civic ex mc...honda part 46100-sh4-a11

 

i have 14's on my ex