As someone suggested, i've been searching through previous pages in this forum, and i've noticed a common occurance. People keep talking about S4s and S5s. What exactly are these? Granted, I love RX-7s, but i've never heard them refered to as S4 or S5. The only S4 I know of is the Audi S4. Answers anyone?

 

S4 = series 4..........86-88
S5 = series 5..........89-91

there are some subtle differences in weight, hp, cosmetics, electronics, mechanics between the 2 series'

have fun