Those front grill covers keep your engine running closer to its optimal temperature. They restrict the amount of cold air moving thru the radiator. Sometimes in extremely low temps, engines struggle to achieve their optimal temperature where they are the most efficient etc. Grill covers won't make it start any easier when cold. For that, you might need the engine block heater. New Ram has active shutter system that automatically regulates the air flow thru the radiators. Definitely no grill covers are necessary here.