some time trying to develop their own system, but when they realised that they could not improve on the system developed by Mitsubishi, they chose to pay the licensing fees rather than come up with a variation just different enough to circumvent the patent. The licensing fees were about US$7–8 per car, which translated to about US$100 () for the consumer to pay. The engine was factory-rated at in its U.S. configuration. Revised bodywork with wider wheel arches, similar to that of the 924 Carrera GT, a fresh interior and upgrades to the braking and suspension systems rounded out the major changes. Models 944 Porsche introduced the 944 for the 1982 model year. It was slightly faster (despite having a poorer drag coefficient), was better equipped and more refined than the 924; it had better handling and stopping power, and was more comfortable to drive. The factory-claimed a 0–97 km/h (60 mph) acceleration time of less than 9 seconds (8.3 seconds according to "Porsche the Ultimate Guide" By Scott Faragher). The car had a nearly even front to rear weight distribution (50.7% front/49.3% rear) courtesy of the rear transaxle balancing out the engine in the front. North American-market cars had bigger bumpers and the front bumper had a larger rubber portion, replacing the auxiliary lights as required by the North American laws. In mid-1985, the 944 underwent its first significant changes, these included: new dashboard and door panels, embedded radio antenna, upgraded alternator (from 90 amp to 115 amp), increased oil sump capacity, new front and rear cast alloy control arms and semi-trailing arms, larger fuel tank, optional heated and powered seats, Porsche HiFi sound system, and revisions in the mounting of the transaxle to reduce noise and vibration. The front windshield was now a flush-mounted unit. The "cookie cutter" style wheels used in the early 944s were upgraded to new "phone dial" style wheels (Fuchs wheels remained an option). For the 1987 model year, the 944 Motronic DME was updated, and an anti-lock braking system (ABS) and driver and front passenger airbags were introduced. The 944 Turbo was the first car to offer airbags as standard equipment; they were optional on other 944 models. Because of the ABS, the wheel offset was changed to , and Fuchs wheels were no longer available as an option. In early 1989 before the release of the 944S2, Porsche upgraded the 944's engine