You've modified your Jeep engine to make it more powerful and a more powerful engine requires more oxygen to run at peak performance. It also requires more cooling because it expels more heat. The solution - a Jeep hood scoop or cowl vent. Installed so that they face the windshield, scoops use the cascade of fast moving air gliding down the windshield and funnel it to the engine to aid in cooling and supply higher density oxygen for better performance. 4WD carries hood scoops from the major off-road brands like Bushwacker, Rugged Ridge and Daystar.