Subaru introduces its largest-ever vehicle for 2006; a midsize SUV with available 7-passenger seating and a standard 6-cyl engine. The B9 Tribeca shares its architecture and powertrain with Subaru's Outback and Legacy and is similar in size to Toyota's Highlander. Tribecas come in base and Limited trim. Both have all-wheel drive without low-range gearing. Seating for five is standard; a 2-passenger 3rd-row seat is optional. The sole powertrain consists of a 250-hp 3.0-liter horizontally opposed 6-cyl that mates to a 5-speed automatic transmission with manual shift gate. An antiskid system, antilock 4-wheel disc brakes, and 18-inch wheels are standard. So are front side airbags and head-protecting curtain side airbags that cover the 1st and 2nd seating rows. All Tribecas have a sunroof and 40/20/40 split folding 2nd-row seats. Seven-passenger models add a 50/50 split folding 3rd-row seat, rear climate controls, and heated front seats. Limiteds add leather upholstery and CD changer. Rear DVD entertainment is optional on 7-passenger models. A navigation system is optional on the 7-passenger Limited.