I'd leave it alone; 8 speeds are more durable generally and shift more reliably.
However, I believe some of the oldest 8 speed freehubs, if my fuzzy memory serves me correctly, might have a compatibility issue (the threading for the lockring wasn't as deep as required for 9 speed cassettes or something like that...or was that 7 to 8 speed conversions?). Think some front chainrings might be a problem too (thicker). Don't forget to change chains too...
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