Like that big-rig stack look? Adding a large diameter and a less restrictive exhaust system effectively relieves back pressure on the engine and turbocharger so it won’t have to put in the same amount of force to shove the exhaust. Diesel performance exhaust system's have many benefits. The most subtle one is being fuel economy and greater engine durability. Diesel Exhaust upgrades are quite significant if you have already added it up with a performance chip, module or tuner. The heat inside the motor gets automatically controlled and a turbo-diesel engine can achieve greater results with minimal effort.