I have a Cusco on my other car, and a Wavetrac on my G37 (also with a 3.90 R&P). Both are awesome. I'm very familiar with the clunking of a clutch-type LSD. But wanted to mention that if your clutch-type diffs are clunking, throw a tube of Trans-X LSD Additive in it and it will make it completely silent. You're welcome.
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