Just the Facts: COP Boot and Pigtail & Socket Assortments Have the parts you need at your fingertips! As wire sets disappear from vehicles, coil-on-plug technology is an important part of ignition systems. Coil boot replacement is part of maintaining a properly tuned engine. This product category will be at the forefront in the years to come. Tight weatherproof boot seal protects against moisture intrusion High temperature material provides greater protection from thermal overload Engineered to the specifications used by the original vehicle manufacturer for exacting fit Stainless steel internal spring with resistor* to suppress RFI and deliver maximum voltage to the plug Improves gas mileage performance Limited lifetime warranty * As specified by Original Equipment manufacturers for designated applications View our 21st Century Tune-Up® video video Back to Just the Facts