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The 956 was designed to compete in group C in Europe and IMSA GTP in the US, starting in 1982. IMSA had rules that were different from group C and they wouldn't let the 956 run over here. Porsche introduced the 962 in 1984 in the US. The biggest change was essentially moving the front suspension forward, to get the drivers feet behind the centerline of the axle. They also mandated a steel roll cage around the cockpit, which was the other big change. Porsche had used aluminum for roll cages for a long time, if you can believe that.
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