That's not how the S15 6 speed works. It has six gears in roughly the same "space" as 5, as misnomer said. the S15's 6th gear ratio (0.767:1) is about the same as the KA's stock 5th gear ratio (0.759:1). So... no improvement whatsoever.
What you want is a double-overdrive 6 speed like the one in the 4th gen Camaro.
But, neither of them will fit on a KA anyway.
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