The Case Magnum 315 8.7 Tier 4A 311hp (All) produces 311bhp and 1531Nm in standard form. Our Stage 1 ECU tuning file raises output to 390bhp and 1820Nm, a gain of 79bhp and 289Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.