The theory is that the hot air in the engine compartment is no better than a cold air intake. But a 440 mopar never had a cold air intake other than a 6 pak. Open element is still best all around solution on the cheap. Mopar action found that out with the scatdak (air cleaner made bigger difference than intake!) Be sure to watch the engine masters episode that was mentioned earlier- was on youtube but on motortrend.com now. Puts a lot of conventional wisdom out on its ear.