The AEM 26-3000RK Charge Pipe Recirculation Kit is designed to work with the AEM 26-3000C Charge Pipe if you intend to use or retain your vehicle's factory recirculation valve and not opt for replacing it with an aftermarket blow-off valve. This accessory kit comes complete with the proper hose lengths and fittings that are necessary for a quick and simple installation. The AEM 26-3000RK Charge Pipe Recirculation Kit is designed to work with the AEM 26-3000C Charge Pipe if you intend to use or retain your vehicle's factory recirculation.