In the United States, the naturally aspirated X (previously L) and XS (previously S) were released in 2003. In 2004, the turbocharged XT trim was released. However, the same model had been available since the late 1990s elsewhere in the world. The X and XS models feature a 2.5 L SOHC EJ253 engine, while the XT model features a 2.5 L turbocharged DOHC engine. Both engines have timing belt (camshaft). The XT model uses the same Mitsubishi Motors TD04 turbocharger used in the Subaru Impreza WRX. All Forester 2.5 L engines are of the interference engine type.