A kit that shores up the integrity of the cooling module (stack). There are a number of places that ambient air can bypass the heat exchangers, feeding the fan directly, reducing throughput. In other places, high pressure fan output, seeks low pressure leaks, causing a recirculation of heated air at lower speeds. IOW, the radiator cannot get cooling from recirculating hot air, eliminate the recirc, and cooler ambient is forced to take its place
These improvements are added, and the cooling system is improved, as well the fan effectiveness is increased
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