i am going to put a new big brake on my FD, but i also have a 96 miata want to have a better big. do u guy think i can put my FD big on the miata. what kind of modife need? the rx-7 on is 5 port but the miata is 4 port

 

It'll be difficult to do properly. You'd have to convert the miata to 5 lug, or get some different rotors with the proper 4 lug pattern. You'll also need to make custom brackets to put the calipers on the miata. There's already some pretty good big brake kits for the Miata, but the stock brakes are more than adaquate for almost anything.

 

thank a lot, i think the brake on FC will fit. i will sell the FD brake to get the other set of brake for the miata