Just brain storming a bit.
First you would need to do a bit of experimentation to find out how much cooling occurs near the solenoid and the line between it and the spray nozzle. If that section of line gets really cold you could wrap it in a coil around a segment of tubing and insulate the outside and put some fins on the inside. If that was placed in line with the air intake it would help cool the air charge by using cooling from the expanding propane that would normally be wasted.
If most of the cooling occurs at the propane bottle you would need to determine if there was any practical way to use that cooling to pre-cool the intake air by passing the air charge around the propane bottle. I can imagine a way to do it if you were using the smaller consumer propane bottles intended for propane torches, but not if you were using a proper DOT rated propane bottle in the trunk.
You could also use a wasted propane (or nitrous/CO2) system that just blew off some of the propane, nitrous or CO2 through a heat exchanger, but that would add some concerns about where the extra propane goes and would it be a fire hazard. This would be similar to the cryo cooler systems.
Larry
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