Hino manufactures their own engines [they are worlds 3rd largest truck manufacturer]. The engines and transmission have won JD Power Award last two years back to back [the first two years the award was offered]. They have a lot of info online at: Hino Trucks / HINO TRUCKS USA - MEDIUM DUTY TRUCKS and SCR AND DEF FROM HINO LIGHT AND MEDIUM DUTY TRUCKS [for 2010 emissions]. The new scr engines have much higher torque also... I just drove a MY2011 338 at a dealer launch ride and drive and it was great...

Disclaimer: my company provides services for Hino -
Note: If you need a contact at Hino let me know!

Hope that helps.
Best!