The Rx-7 was completely redesigned for 1986 with independent rear suspension, 13B fuel injected engine and Porsche 944 style bodywork. Weight was up quite a bit and the Rx-7 moved more towards a GT style car. VINs begin with FC so this generation is often known as the FC. A turbo model was also optional (except in Japan where only the turbo was sold). In 1988 convertible body style was offered. (Quoted from http://oldcarjunkie.wordpress.com/2010/08/06/mazda-rx-7-spotting-guide-1979-2002/)