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All USDM GS-Rs are 5 speed, manual transmission.

A local friend of mine has a JDM B18C3* with a 4 speed automatic in his 99 Civic. There were a few GS-Rs sold outside of America that came with a slushbox.

*(The reason why it's a C3 is because it was exported for Asian markets, yet retained all of the JDM B18C qualities, including the 180hp and final drive ratio)