This is an aged project, but it works very well. Problem: cold air intakes for sports cars invariably have an uninsulated passageway that traverses the top or front of the engine compartment. So, by the time the "cold" fresh air gets to the intake manifold it has been thoroughly heated by the engine. I put such a system on my off-road Chevy Avalanche. In order to keep the cold air cold though, I encased the airpipe with a second larger pipe and configured air vents to allow fresh air to run past the inner airpipe cooling it down further. The air vents to the second pipe are fed by an air scoop on the engine hood. The air through the second pipe exhausts right at the throttle plate. I also have a thermal sensor mounted here so I can measure the temperature of the inner airpipe (and thus the max. temperature of the air going to the throttle plate).
This system of course only works while the car is moving. It is very effiicient. The measured airpipe temperature is between 8 degrees - 12 degrees warmer than outside temperature when the car is moving faster than 30mph. Most often it is at 8 degrees above ambient.
The second air intake pipe shown in the picture is to induce more cold air into the air filter chamber.
