Cold Air vs. Wisper
Your assumption that the pavement is hot only affects the intake temps when it is sitting still. As soon as the car is moving, it is breathing ambient temperature air.
In contrast, the factory set up on an LS1 car breathes underhood heated air. If you look at your IAT temps, they will always be quite a bit more than ambient. It's just not a great system and the reason why just about aftermarket and even some factory systems try to gather cold air from the fender panels etc.
Colder air does equal more power but that is only one part of the additional power the FTRA provides. When the car is moving, their is a mild pressure increase in the intake system which improves the volumetric efficiency of the motor. This not only improves power, it also improves throttle response and fuel economy. Most people with the FTRA report 5-7 % better fuel economy. With that being said, the FTRA will eventually pay for itself.
Yes, you can have your cake and eat it too!
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