I am new to this site and I am upgrading my brakes to a true free floating design I came up with. I'm using brembo rotors with AP racing six pistons in front and four pistons on rear. By the way I have a stock 2004 wrx. I machined the bells out of 7075 aluminum and the bracket is 6061 aluminum. I will be installing this setup for a track day event next weekend. I believe this will provide me with superior fade resistance, a solid pedal feel as well as even pad wear.