If you can find a cheap low milage VLSD go for it. They are just fine for street use and are the least harsh and daily driver friendly LSDs out there for the money. They don't suddenly go from locked to unlocked backed to locked again like some cheap locking diffs can. A VSLD won't be good for a track since it will heat up and as it does it will slowly become more and more like an open diff till it completely overheats when will not be any different than your current open diff.
Also after 30-50k miles the fluid, not the gear oil, breaks down and will not do its job. This fluid is not user serviceable and a replacement will be needed of the vlsd.
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