the tall end should have nothing to do with drifting, it would only really be useful on the highway (better gas mileage).
It's also been said (and I believe it) that the 6spd tranny (i assume we're talking about the silvia s13/14/15 5 speeds and the S15 spec-R's 6 spd trannies) from the S15 is slightly weaker than the 5-spds because there's another gear in the same sized tranny, and in order to fit another gear in there they had to make the other gears smaller.
from what I hear, "drifters" actually change the 6spd out of the spec-R in favor of the 5-spd, because it can take more abuse.
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