This looks like a kit to replace the front rotors and calipers only. You guys do realize that increasing the braking force at only the front wheels isn't really going to net you any performance benefits, right?
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Wilwood has a proportioning valve as well. The guy that made those kits didn't use it, as he liked the balance the car had afterwards. From what I know, he's pretty competitive in STX...
Like I said (and Titus pointed out), I will get the proportioning valve if I don't like the balance afterwards. This brake kit uses a 12.19" rotor and a 4 piston caliper. The stock rotor is 11.8" (same as the S2k, I could use an aftermarket S2k brake kit if I wanted, I would just need to find a bracket). The rears are 10.2", so the step up to 12" isn't all that bad. It's not like I'm going from a 10" rotor to a 13 or 14" rotor...