A cold air intake is a device used to bring down the temperature (http://en.wikipedia.org/wiki/Temperature) of the air (http://en.wikipedia.org/wiki/Air) going into a car (http://en.wikipedia.org/wiki/Automobile)'s internal-combustion engine (http://en.wikipedia.org/wiki/Internal-combustion_engine), to slightly increase engine power. A secondary goal is to increase the visual appeal of a car by changing the appearance of the engine bay. It may also slightly increase fuel economy, and can increase the life of the engine by allowing it to run cooler.
Standard air intake systems tend to be restrictive, in order to save under-hood space and minimize noise in the cabin of the car. Aftermarket (http://en.wikipedia.org/wiki/Aftermarket_(automotive)) cold air intake systems come in many different colors and sizes, and are easy to install when compared with other performance-increasing modifications

All cold air intakes operate on the principle of increasing the amount of oxygen (http://en.wikipedia.org/wiki/Oxygen) available for combustion (http://en.wikipedia.org/wiki/Combustion) with fuel (http://en.wikipedia.org/wiki/Fuel). Because cooler air has more density for a given 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.

Some strategies used in designing cold-air intakes are:

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 (RPM).
using a more efficient, less restricting air filter (http://en.wikipedia.org/wiki/Air_filter).

Wow, I did not know you knew that. J/K Thanks for that post :old:

Does a cold air intake really work and is it worth it to get one. Will it increase the horsepower and make the car sound lounder. How much will it cost to get one and where should i get one at. Thank you for the information.

Does a cold air intake really work and is it worth it to get one. Will it increase the horsepower and make the car sound lounder. How much will it cost to get one and where should i get one at. Thank you for the information.
Depending on the CAI you get the answers would be yes, yes, yes, about $300 and I would say that Maryland speed wouldn't be a bad place to get one. I would also recommend getting the predator tuner to take advantage of the untapped horsepower in your motor.

nanook is right on the money - there are many different kinds out there, but in a nutshell they all pretty much accomplish the same thing - there not hard to put on (usually in 30 minutes - just give me a shout and i will help you) - Rdp Motorsport and Maryland Speed are good places to get them at - a very common combination that will definitely wake your charger up is a cold air intake, 180 degree thermostat and the diablo predator tuner (which is a handheld tuner that plugs into and then back out of your charger and replaces the tune in your ride to a more aggressive performance tune, it also can read and clear codes among many other features - stop by one day when you get a chance and i will show you one and better explain it)