The 2011 Sienna rides on the same wheelbase as before but is slightly wider and shorter overall. Powertrain options for the range—which includes base, LE, SE, XLE, and Limited models—will include a 3.5-liter V-6 producing 266 hp or the 2.7-liter four-cylinder with 187 hp, both of which are mated to a six-speed automatic transmission.