Ultra4 continues to push the envelope, and the drivers who are mad enough to race the series are pushing that envelope even further. While many races still benefit from a solid rotor design (think east coast races, King of the Hammers) there are new Ultra4 races that are demanding more temperature control for the brakes. Think the Ultra4 Nationals or the Fallon 250, some races would simply benefit from a vented rotor design. With that, we are proud to partner up with Wilwood, once again, to bring the Wilwood GT Vented Rotor to the Ultra4 world. Learn more about all these new brake components at http://www.spidertrax.com/products/Brakes .