FHI 4pots aren't differential bored. Brembos are.
You can flip FHI units left/right to get the right bleeder orientation and they'll work fine. Brembos won't.
Furthermore, Ken@KNS Brakes aka WRX Brakes now carries rear adapters that locate the rear FHI 2 pots to the 08+ WRX knuckle assembly. Theoretically, one could take the FHI 4/2pot setup and place it on the BRZ (if the rear suspension is lifted entirely out of the WRX, as was suggested in an earlier thread).
Again, the FHI 4/2 setup provides no heat capacity over stock; only increased modulation of the pedal and more rearward bias (at least, in the WRX it moves bias rearward).
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