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6.7L Cummins owners: Our add-on cold weather kit for the Fleece Performance intake and grid heater kit provides proven engine startability down to -35° centigrade! Optimized heater design and placement in the intake air stream ensure you get the most efficient heating possible. Compared with other grid heating kits on the market, the Fleece Performance kit achieves the same levels of cold temperature startability with lower wattage and less strain on your grid heater relay! Kit includes: 700W heater High flex heater cable Installation hardware Recommended Cold Weather Startability Configuration: Sustained Temperature Fahrenheit (Centigrade) Configuration Sustained Cold Startability Test 32°F (0°C) Single Heater PASS 23°F (-5°C) Single Heater PASS 5°F (-15°C) Cold Weather – Dual Heater PASS -13°F (-25°C) Cold Weather – Dual Heater PASS -31°F (-35°C) Cold Weather – Dual Heater PASSAll testing was performed on a 2024 Ram 2500 with the block heater in use and sufficiently charged 12V batteries. Oil and weight: Freedom Series 100% Synthetic 10W-30