[calispec]

Front brembos off an STI:
4 piston 40mm and 46mm
1/2 piston area = 2918.5 mm^2
Effective diameter = 268mm

Brz OEM calipers front:
2 piston 42.8mm and 42.8mm
piston area = 2877.44 mm^2
Effective diameter = 247mm

If both see the same line pressure the brembos will see 6.74% more stopping [force] (edit: torque) than the OEM calipers.

I didn't bother doing the rears because I knew it was going to be way worse and didn't want to spend the time trying to find the information on them.

With stickier tires you will see more weight transfer because you are stopping faster. Probably somewhere in the 4-7% range. I think it's safe to assume with sticky tires the brembos on the front will work out to be pretty great.

That's what I did. I have a lot of hours on track with them and so far I love it.

Hopefully we can figure out how to put those calculations on the first page so people don't have to sort through 5 pages to get it.