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I think in stock form the Torsen unit supplied with the car is just fine. Generally, you may want to go to a clutch type differential if you have more power or torque that our cars provide in stock form. Grassroots Motorsports Magazine did a test with their project Miata earlier this year. I have attached the relevant parts of their article that you can read.
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My cars always dress formally. They all wear black tires.
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