to drop intake air temperature without having to compromise the possibility of the engine ingesting large doses of water in the rain or flood, you can have an extension of the suction side hose between the connection at the firewall and the compressor low side. an aluminum coil or loop inside the intake tube will drop the intake air charge a few degrees fahrenheit. taking advantage of the residual "coldness" of the refrigerant before it returns back to the compressor does not take up energy.