scion xb cold air intakes operate on the principle of increasing the amount of oxygen vailable for combustion  with fule . Because cooler air has a higher density (greater mass per unit volume), cold air intakes generally work by introducing cooler air from outside the hot engine bay. However, the term "cold air intake" is often used to describe other methods of increasing oxygen to an engine, which may even increase the temperature of the air coming into an engine  cold  

Some strategies used in designing cold-air intakes are xb cold

• increasing the diameter of the air intake, allowing increased airflow.
• smoothing the interior of the intake to reduce air resistance.
• providing a more direct route to the air intake.
• tuning the length of the intake to provide maximum airflow at certain engine speeds  
• using a more efficient, less restricting air filer.xb cold

A cold air intake is a device used to bring lower temperature xb cold  air into a cars inter-ion, combustion engine to increase engine power and efficiency. It also enhances efficiency through higher flow,xb cold and can increase the life of the engine by allowing it to run cooler xb cold

The most basic cold air intake replaces xb cold  the stock airbox xb cold  with a short metal or plastic tube leading to a conical air filter, called a short ram air intake. The power gained by this method can vary depending on how restrictive the factory airbox is. The placement of the filter is usually directly in the engine compartment. The overall benefits depend on the specific application. Power may be lost at certain engine speeds, and gained at others. Because of the xb cold  increased airflow and reduced covering, intake noise is usually increased. This effect is usually amplified on applications where a resonator, a part intended to reduce intake noise on some vehicles, is replaced by the intake.xb

Well designed intakes use heat shields to xb isolate the air filter from the rest of the engine compartment, providing cooler air from the front or side of the engine bay. Some systems called "fender mount" move the filter into the fender  xb wall, this system draws air up through the fender wall from below the car, which provides even more isolation and xb still cooler air. Carbon fiber can be used for the piping instead of metal, reducing weight and insulating the air from the engine bay in some cases. Carbon fiber and other advanced composites (such as Kevlar) are expensive, and can be more aesthetic rather than functional.