If you are given the choice of being in a hot stuffy room with stale air and a cool open environment with lots of fresh air you would choose the latter. In fact all humans will choose the latter because one cannot perform to the best of one's ability of one is in an environment which is hot and the air is not fresh.
But if you own a high performance car like a G35 you can opt for the very cool looking G35 cold air intake which will capture cool fresh air from the outside and with a very short path carry the air directly to the engine's combustion chamber. And now since the air is cool it is dense and more will fit inside. You will get more efficient combustion which means you will get more power and better fuel efficiency. And therefore the cold air intake will pay for itself by saving you fuel costs.
You of course have less unburnt fuel in your car's exhaust gases as well which makes your car more eco-friendly. You also get the signature performance car sound as the cold air intake sucks the air to carry it to the engine. A cold air intake is not very expensive and you can buy it conveniently by going online. You will get great value for your hard earned money. You can see the latest G35 cold air intakes at www.ilovebodykits.com.