Better diesel engine performance with least modification

The only problem that I have heard about with the diesel engines is that they make too much noice. Otherwise, the Diesel Performance can be very efficient. But not only this, diesel engines are very receptive of performance enhancing solutions such as diesel performance chips & tuners, exhaust systems , air intakes, propane and nitrous. One of the most direct ways to increase the performance in terms of power and fuel efficiency of the diesel trucks such as Chevy duramax, Dodge cummins and Ford powerstrokes who although are packed with great power from the manufacturers itself can be fitted with diesel performance product to derive power in excess of 500 hp and over 1500 ft lbs of torque and still get 20-25mpg on the highway.