Horsepower makes heat, and the Tundra engine makes a lot more horsepower than the stock 3.0 V-6. To keep the i-Force V-8 cool, Will uses a custom-built AFCO radiator and three Spal fans. There are two pusher fans in front of the radiator and a single puller fan in back. Note that the back side of the radiator is completely covered by a shroud except for the area next to the fan. This shrouding ensures that all the air flows front-to-back and through the fan.