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Wish there were more hard facts on this. This old thread is the only real conversation i can find on this site. But from my very limited knowledge and using an online brake bias calculator using the STI front calipers and the rear 08+ 40mm calipers the bias is almost exactly the same as the stock set up on these cars. Now the breaking force of the sti calipers may not but a lot better than stock but the larger rotor size should help significantly with brake fade and cooling on track. From my research the brz brembos have a piston size of 40mm the STI is 40 and 46mm. The rear 08+ sti is 40mm and I have no idea of the performance pack piston size but im willing to bet it is damn close but more likely smaller than the STI. So yes the STI front brembos have more total piston surface area than the performance pack but im willing to bet so does the rear. So if it works for the performance pack im sure the STI calipers will work well too if not better. Also I dont want to hear "but they weren't meant for this car" the ft86 uses brakes from a wrx,lgt, and the rear suspension from about 10 different Subaru's so i think its fine if we do what they have been doing for years.
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