By crafting the headshield out of aluminum, it provides a true, lifetime solution. Valve simulators: AWE has engineered an electronic solution to simulate both AFM and NPP valves, resulting in the ECU remaining happy, allowing the C8 Corvette to operate at full stride with no CELs and maximum peace of mind. Each kit includes two pairs -- one for AFM, and the other for NPP. If your C8 does not have NPP, only one pair will be used. Purely plug-in and rip! Tip Options: The Touring Edition Exhausts feature statement-making quad 4.5” tips, double-walled, slash-cut tips in either chrome silver or diamond black, complete with a stamped AWE logo.