I wouldn't waste money on the JCW brakes. They're more of a "show" bbk than a "performance" brake. Is there more material? Yes. But if your doing HPDE's then know the JCW bbk have steel and PLASTIC pistons. They are prone to crack and give you more than headaches if your really pushing it. GP2 is the real deal. But they are pretty ridiculously priced. I personally opted to go to TCE and get a Wildwood kit. Wilwood has multiple rotor, caliper, and brake pad options that will fit your exact need on the track. I originally got the street kit last year. Decided later I wanted to track my MINI. Found out I can buy parts and convert my calipers to track orientation with stainless steel pistons at a surprisingly low price. Needless to say I'm very happy with the kit and the performance I've received.
