Furthermore, for every 10 deg F you reduce intake temps, you'll gain 1% horsepower (there are also other factors to take into account such as humidity). I'd like to see how a non-metallic spacer is going to save the day in reducing 10 deg's or more!
So for instance if you're pushing 250hp to the hubs, that's an increase of 2.5hp for every 10 deg's lower intake temps.
If you want to compare the motordyne, mine and the non-metallic feel free to purchase one of mine. I've undergone huge research in creating the spacer, as like to the thermal properties of the gasket and the aluminium spacer itself.