even on the earliest models, which few contemporary vehicles did in the late 1990s. The basic structure included a robust passenger safety cage, front and rear deformation zones, reinforced door posts and pillars, as well as the "Pendulum B-Pillar", which combined high-strength low-alloy steel at chest and head height with tailored blank steel at the floorpan, designed to direct the crash forces down toward the floor. The design was proven by the Insurance Institute for Highway Safety (IIHS) to protect occupants in side crashes, even without the addition of curtain airbags or rear side airbags. From 2002, ESP (electronic stability control) was included as standard. Another Saab feature, the "Night Panel", permitted dousing of the instrument panel lighting, except for essential information, for less distraction when driving at night. Once activated, only essential information such as current speed is displayed except, for example, if the car requires fuel or the engine overheats. In the United States OnStar was available, and provided as standard equipment in selected 9-5's from 2001 onward. Comfort The 9-5 had various comfort features both as standard and cost options over the years. While early models frequently had dash mounted cassette decks, CD changers were standard features on many cars and in-dash satellite navigation was also available. Factory-fitted phone kits were similarly optional. Many models featured leather or part-leather upholstery and both front and rear heated seats were also available. A few models were shipped with the optional ventilated seats. Cruise control was available on various models and xenon headlamps were fitted as standard on high-end variants. Aero The performance 9-5 Aero, the earliest versions of which were sometimes referred to as the HOT Aero, was first released in 2000 with a 2.3T B235R engine. The B235R engine of the 9-5 Aero was capable of providing immense torque and, in terms of acceleration, outperformed the contemporary Porsche 911 Turbo from 40 to 90 mph. Initially badged as a engine, Saab later conceded that the 230 PS power figure was quite conservative, with the manual versions rated 250 PS and having more torque than stated. This flagship model had a long list of standard features, a sport tuned suspension, and body side moldings. In 2002 a 2.3 turbo engine was made standard, which allowed for more torque after 4500 rpm. All Aero models from 2002 to 2005 have an identical engine layout and management system, with the 2002-05