Figured this would be useful information, for those like myself who can't afford Brembo or equivalent upgrade brakes..
My car hit 100,000 miles the other day, in its 100,000 miles run, it has had one set of brake pad change (Hawk HPS), and about 60 autocrosses.
So my rotors were toast after 3 or 4 runs at an larger course autocross the brakes would fade and the pedal would become all mushy and useless, I had to solve this problem, since my rotors were pretty mangled, I had read on both NASIOC and 25RS as well as ScoobyMods about RS owners upgrading their rotor size to WRX rotor size. Year depending, my 2005 had the 276mmx24mm rotors. WRX bears the 294m24mm rotors. It's a good 18mm bigger in diameter.
Instead of just buying new RS rotors and being done with it I decided to get WRX brake caliper brackets and run the WRX rotor sizes.. It's a cost effective way to get the most out of the OEM braking system without converting to either the OEM Subaru 4-Pot/Big Rotor upgrade or Brembo/Equivalent.
I've taken some comparison shots to show what difference there is..
This improvement is probably more noticeable on the older GC RS's, which pending on year may have the 260mmx24mm rotors. This would be a huge improvement for those cars..
I haven't finished doing the rest of the brakes yet so i'll update with feedback.
I'm on HAWK HPS right now, but primarily will be using these with the better compound HAWK HP+ later this month, maybe next.
There was raised concern when I posted this over on NASIOC by an individual about the 8% torque increase in the front due to this upgrade..
Personally 8% is not something i'd worry too much about if I knew there was better heat management, stability (instead of possibly having too much rear bias and looping it braking hard into a corner) and would only be more critical if I had done a major upgrade, 4pot Rotora/Stoptech/Brembo.
Hope this helps those questioning, if need be I can put up part #'s.