Yes, cold air intake kits do work. Cold air intake kits are designed to increase the amount of cold, dense air that can enter your engine. This helps improve the performance of your vehicle by providing more oxygen for a stronger combustion cycle and allowing for more power with less fuel consumption. Additionally, increased airflow through the engine can help cool it down and reduce heat soaks as well as lower exhaust temperatures. This improved efficiency can lead to an increase in horsepower and torque while also improving fuel economy. Depending on the type of kit you purchase will determine how much improvement you'll see in terms of measurable performance gains but you may notice improved throttle response from even basic intakes as well. Ultimately, if installed correctly, a cold air intake system could be considered one of the most cost effective modifications available for boosting power and efficiency in your vehicle's engine without having to spend too much money or time on other complicated upgrades.