I also did a tuned OS Giken 3.3 LSD diff. You need to source an auto diff and buy the 3.3 from OS Giken. They are the only ones that offer a 3.3 clutch style LSD. For $150 they will tune it for you in California before shipping to you. Just give them your specs. The downside, you lose cruise control above 75mph but I don't use that anyways. LOL
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