BMW began redesigning its most popular lineup for 2006, giving it new styling and more power, along with BMW's iDrive control system as an option. A new premium compact sedan went on sale in mid-2005, as a 2006 model. A new wagon emerged in the fall of 2005. The 2006 3-Series sedan and wagon were 1.4 inches longer in wheelbase, 2.2 inches longer overall, and 3 inches wider than the 1999-2005 versions. Rivals to the 3-Series included the Acura TL, Infiniti G35, and Saab 9-3. Every 2006 sedan and wagon had an inline 3.0-liter six-cylinder engine. All-wheel drive was available on sedans and standard on wagons; AWD models were designated with an "xi" suffix. Others had rear-wheel drive. BMW's 325i and 325xi models had 215-horsepower engines, up from 184 in the last generation's 2.5-liter six. Wagons were available only as the 325xi. The 330i and 330xi models had 255 horsepower (30 more than the prior generation). For all, a six-speed manual transmission was standard, with a six-speed automatic optional. All 2006 3-Series sedans included a sunroof, traction/antiskid control, front torso side airbags, and head-protecting tubular side airbags that covered both seating rows. Wagons had a larger "panoramic" sunroof. Also standard were a tire-pressure monitor, run-flat tires, and dual-zone automatic climate control. Steering-linked xenon headlights were optional on 325s, standard on 330 models. An optional Sport Package included a sport suspension and 17-inch tires, to replace standard 16-inchers on 325s, or 18-inch tires versus 17s on 330 models. Active Steering, which electronically varied steering ratio and assist, was optional. BMW's iDrive, which used a console "joystick" knob to control entertainment, navigation, communication, and some climate functions, came with the available navigation system. Other options included leather upholstery, heated front seats, rear obstacle detection, and satellite radio. Also offered were adaptive cruise control, designed to maintain a set following distance; keyless ignition; and BMW Assist emergency and concierge service. The latter included an interface to use the audio system as a hands-free, wireless link to cell phones. Coupes and convertibles continued unchanged into 2006 with the design that had been introduced for 1999, awaiting a redesign for the 2007 model year.