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Fuel Injector and sensor covers solve the problem of rough idle, stalling and vapor lock due to hot fuel. In hot temps, both performance and factory fuel injectors can be at risk of vapor lock or heat soak causing a rough idle, slow starting or other potential serious engine problems. DEI has the solution by introducing Fuel Injector Reflective Heat Covers available in packs of two, four, six or eight, that reflect direct and radiant heat away from the injectors. Constructed of high-temperature rated glass fiber material bonded to a heat reflective aluminized material, DEIÂ's Fuel Injector Heat Covers can be used on most any engine configuration utilizing stock or aftermarket fuel injectors. Cooler fuel injectors will perform more efficiently, offering a more consistent throttle response. Installation is a breeze as the injectors do not have to be removed. The covers are made with a split design allowing them to wrap around each individual injector and are secured with a sewn-in hook and loop fastening edge. Universal - fits most fuel injectors & sensors Cooler injectors operate more efficiently Prevent vapor lock & heat soak Easy installation using simple hook and loop fastening 5.25 in. x 2 in.