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stainless steel does not transfer heat as well as say aluminum, stainless steel pots and pans will usually have copper or aluminum bottoms in order to distribute heat properly. the only real advantages of SS over aluminum for your application would be corrosion restistance and greater strength. Wrapping the induction system with some sort of insulation that has a reflective coating may help slightly, but I don't believe it will do much. Aluminum is a great conductor of heat, meaning it transfers heat energy exceptionaly well, thus placing a plain aluminum pipe in the engine bay will cause it to heat the air in the tube more quickly then say plastic. That's why many are coated with heat resistant materials such as ceramic.

Many people argue that when they shut off their car the aluminum pipe feels cooler than the rest of their engine, the reason, the aluminum has realeased it heat energy so quickly, into the engine compartment and your intake air that it no longer feels hot. The most likely reason AEM uses aluminum, wieght, and the fact that its cheap and easy to bend.
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