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Our final temp check was taken with the wraps in place. After pulling back the wrap slightly (it's held in place using Velcro and must be tight on the fuel rail to ensure the covers will stop the most heat possible) to expose the rail, the readout showed a 106- to 107-degree (Fahrenheit) temperature range for the covered fuel rail-a decrease of approximately 5 to 6 degrees. It's important to understand that this data certainly is prone to being different per higher or lower underhood and ambient temperatures (ambient temp was in the middle 70s in our test environment). For the sake of our independent and unofficial review, the fuel-rail wraps did protect the rails from the influence of the two heat variables.