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I believe you are going the wrong way with your ratio. It should be a smaller number to stretch your revs out. The Lexus IS300 diff is a direct swap pumpkin iirc M85 is the code you're looking for there. I think that's a 3.65 ratio with LSD. I don't know anything about the Cusco diffs but I know replacing the final drive gear is much more expensive than swapping pumpkins unless you can do it all yourself perhaps
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