The Central 20 final drive for the 350Z was actually decently priced compared to other brands.
For the 370Z, I don't think it's worth upgrading to 3.9 gears. The MT 370Z comes stock with a 3.7 final drive, so unless you make the jump to 4.10s, I don't think it's worth it. 4.10s will offer a good acceleration bump, but I don't like 4.10s for a daily driven car.
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