I don't think there is anything out there with longer ratios. The idea of the gears being able to take more power is they have less teeth. This means the teeth they have can be larger/thicker hence stronger. Have you considered a STi 6-speed swap?
i have thought about the STI tranny swap. however i dont have the 7k for the swap. the V6 RA gears are about 1400, and the new syncros are 255. including labor the job is 3700 and change.
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