I have an '84 Corvette Hot Rod where I removed the A/C evaporator and fan from the engine bay. I made some sheet metal to cover the fan vent and evaporator vent and used this duct hose along with the 3" duct flanges that Specter also sells to hold the heatsink core in place and keep the heat dissipation going. I don't have a fan anymore but for recirculation but I can emit heat when the car is moving and it works great! The air duct is about 1.5-2 inches from the head pipe. I was afraid it might melt, but so far it's holding up great.
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