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Air is necessary for successful combustion in your engine. A typical diesel engine requires 200 gallons of air for every gallon of fuel per hour to produce 1 Hp. Thus 300 Hp engine would require 60,000 gallons of air for every gallon of fuel per hour. thus clean air is critical to engine survival and vital to its performance.
In Either case (Both TC/NE) the induction system (ducting, hoses and reducers) brings outside air to the engine. The system should have enough intake capacity to meet engine requirements for air flow, avoiding sharp bends or constrictive ducting.