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Your best bets are changing wheel/tire overall diameter for a bit more gearing or switching out the NA6 4.3 gears for NA8/NB8 gears of 4.1. The newer NB8(the VVT engine I believe) run 3.91 gears and the 6 speed Mazdaspeed tranny ran 3.63.
The 1.6L was geared extremely low for performance and acceleration around the roads/track at 4.3. It tops out at about 125mph and that's fuel cutout limited at redline....not drag related or governored....That's all she is geared to do.
On the highway though, only the 6 speed is going to give noticeable results with a different tranny, as they all use the same final gear ratio minus the 6 speeds. 0.81 vs. 0.84, so drag reduction and a larger diameter wheel/tire setup are generally cheaper and simpler methods of getting better gearing(while throwing the speedo off obviously).
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