That's a persistent rumor without a whole lot of basis. Even if it was true, just because a lot of people in Japan do it doesn't mean it's the right thing to do.
It will fit on any SR, but there's no great advantage to having it that would justify the cost.
Just FYI, the Australian press has complained about the S15 6-speed on various occasions. It's a close-ratio box, so it's not going to drop your cruise RPM or increase your top speed... just force you to shift more often. It'd be useful on a peaky naturally aspirated engine...
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