The UR is the evolution of the UZ series. The 3UR is a 5.7l 32 valve VVTi with aluminum block and head. Stock 381 hp and 401 ft lbf. Used primarily in the Tundra, Land Cruiser, and the LX 570. A TRD supercharger is available for 504 hp and 550 ft lbf but that's a bit much for my drive train.