If you own a GD WRX (2002-2007), your car is probably getting up there in miles and if you need to go through your brakes, there is a nice low buck alternative to expensive aftermarket big brake kits. With a little bit of effort, you can upgrade your car too much better STI brakes for not too much money. The stock WRX comes with smallish two-piston sliding caliper front brakes and a single-piston rear caliper with a smallish solid rear rotor. The STI brakes are made by Brembo and are an order of magnitude better. All it takes to do this conversion is a special rear rotor by DBA which makes it an easy direct bolt-on!
The STI calipers are made by Brembo for Subaru and are racing type fixed calipers with 4 pistons in front and 2 pistons in the rear. Unlike the stock iron calipers, the Brembo/STI calipers are lightweight forged aluminum.
Unlike a lot of racing-oriented 4 piston calipers, the STI calipers have full dust seals. They also have stainless steel pad abutments that prevent the steel pad backing plate from digging into the aluminum. This assures long life and smoother, quiet operation over time.
The rear calipers have the same features as the front. As the calipers are engineered for the car, they have the correct hydraulic proportioning so the bias will be correct for good ABS function and the pedal feel will be perfect.
A DBA STI front rotor was used with a DBA STI to WRX conversion rear rotor.