Aeroflow Performance ceramic spark plug boots and terminals have been developed to address the problems associated with burnt spark plug boots. Whether you're running headers with close tolerances, a turbo manifold and dump pipe with very littleroom in the engine bay for heat shields or you're just over melting your spark plug boots from extreme heat. Theseblack ceramic wire boots are the answer! They can withstandtemperatures of up to 1090°C (2000°F). You can match these with our XPRO ignition lead wire that is 8.5mm spiral wound low resistance with high EMI suppression which is sold separately in different lengths along with spark plug boots to completely custom make your new set of leads or just re-crimp your current lead sets to upgrade them.