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tjts1, I really like that cover you have under your car. I'll add that to my list
Here is what I read about hot air cold air
The hot air intake functions by drawing in air from near the engine, which has been heated due to internal combustion. This warm air causes the fuel mixture in the car to drop, thereby lessening how much fuel is used and increasing mileage.
The Volvo already has hot air intake with a thermal flap in the air box that goes to exhaust Manifold. (Mines rigged to open all the time) Once the car heats up it switches to out side air to increase HP.
Cold air = More O2 More fuel more power lower mpg
Hot air less O2, less fuel, less power Better MPG
It works with MAFs but not cars with MAPs
You can un hook the hot water lines to the intake manifold to get even more HP but less MPG. Turbos' have intercoolers to cool the air before the throttle body. again more HP. SC
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