Refers to the chasis code of early models of the Mazda RX-7 (circa 1988 - 1991 in the US). The full chasis code was FC3S, but since just about all versions of the RX-7 have a "3S" ending, the first two letters are used to differentiate between this generation and the later "FD" generation (circa 1993-1995 in the US).
The FC3S RX-7 is known for it's 13B Turbo Rotary engine, especially for it's high maintenance standards and tendency to "blow" often.
The anime series Initial D features the FC3S RX-7 as the final rival car of the main character.
Ryosuke Takahasi's FC in Initial D
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