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We wrote this guide to help answer some common questions regarding Torsen limited slip differentials in NA and NB Generation Miatas. We'll be focusing on what the Torsen is and what it does, which cars they came on from the factory, the various gear ratios available through the years, what's needed to upgrade your specific year Miata, and some recommendations at the end.What is this "Torsen" thing you speak of?Torsen is the brand name of the limited slip differential available in Miatas from 199 …