the thing with rear break upgrade is you won't feel a huge diference because cars are desing with a 70/30 brake split. Where the front does more work than the back

 

look what honda made stock with those sized brakes (my guess is the si) so use a si prop. valve and master cylinder and you should be fine.

 

as long as you get the ls non-abs master cylinder. make sure you check out the holes to make sure they are in the same position as your stock mc. or you can also just get the mc from a 91 civic ex sedan with 4 wheel disc's and it will work with your stock booster. its a 15/16ths mc just like the teg rs/ls.

 

that^ will be harder to find than that of a teg.