A (cold) air intake is a device used to bring lower temperature air into a car's internal-combustion engine, to increase engine power and efficiency.
It also enhances efficiency through higher flow, and can increase the life of the engine by allowing it to run cooler.
A Leaking air intake system can cause symptoms like insufficient power on full or partial load. Additionally, it can be the reason for an unsteady idle speed or increased mileage.
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If there is a leak in the air intake the only way to fix this problem is to change the air intake.
Therefor the old/factory air intake system has to be removed from the car. At this point it is highly recommended to check if there are better/custom air intakes which offer an increased engine power and efficiency than the standard/factory air intake.
Afterwards a new air filter has to be installed by attaching it to the air intake pipe. The new air filter should always be checked that it is pre-oiled and not damaged.
Finally the new air intake can be installed.