The Rolls-Royce Trent XWB-84 Enhanced Performance (XWB-84EP) is a distinct A350-900 turbofan variant with upgraded fan, compressor, turbine aerodynamics, and turbine-blade cooling. Airbus certified the A350-900 with this EP engine in 2025, and Rolls-Royce reports entry into service in May 2025 and measured in-service fuel-savings improvement; the exact two-engine A350 installation is already represented separately.