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This can easily be done with any BJ Mazda Protege with the 2.0 manual. The MX6/Probe/626 used the same gearbox, and both final drive and 5th gear are longer. Swapping 5th gear alone is painless and lowers cruising rpm from around 3200 at 100 km/h to around 2900-3000.
Even better, if you can order a fifth gear from Europe, the 5th gear from the diesel Familia should lower cruising rpms to under 2500 with the same final drive, and it would likely be much more durable than a custom-ground gear.
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