They put one on a zx-14 in SSB (superstreetbike magazine, in the long term section) and said it was the best $70 investment made to the bike by far and well worth the money. If the f4i or zzr had one, it wouldnt go faster anyway, need gearing!
Actually, your zzr is still carb'd anyway, no electronic fuel injection to change (or fuel mapping as referred to here) so buy a jet kit and a pipe.
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