Utilizing Symmetrical All-Wheel-Drive the engine is a 256-horsepower, aluminum, 3.6-liter flat-six that drives all four wheels full time through a five-speed automatic transmission featuring manual sequential shift control. Available in Premium, Limited, and Touring trims the Tribeca includes 7-passenger seating and features like power heated front seats and mirrors. Options include leather upholstery, moonroof, and navigation package. Safety features include dual-stage frontal airbags, seat-mounted side impact airbags, curtain airbags, active head restraints, and a tire pressure monitor.The 2011 Subaru Tribeca is a carryover from 2010.