Lets talk about an Intercooler on a Semi Truck. An intercooler is basically a radiator. In a Truck, intake air is compressed by a turbo charger. When air is compressed quickly, it heats up. If this hot compressed air is pulled into the engine, the engine will overheat.

Enter the intercooler. The hot air is passed through the intercooler, like coolant is passed through the radiator, cooling the air down, so the engine will not overheat, but still benefit from the higher compression obtained from having compressed intake air.

Personally, just going by the pictures posted here, I don't think he will benefit much from all the work he went to.

Dave