Isx15 Diesel Engine for for Highway Vehicle Truck Detailed Photos Advantages Excellent Fuel Economy : Equipped with XPI ultra-high-pressure fuel injection system and VGT turbocharger, achieving up to 5% fuel efficiency improvement over comparable products, significantly reducing long-term operating fuel costs. High Power Density & Broad Power Range : Power ratings from 400 to 600 hp with peak torque up to 2,050 lb-ft (approx. 2,779 N·m), meeting diverse export market demands