vlsds are garbage. dont jump on the j30 wagon, they hardly ever lock, and when they do its at the wrong time. the only vlsd i didnt hate was my 180sx, but i still didnt like it. i would say 1.5 way for a daily/sometime track, or a 2 way/ welded for a dedicated track car. 2 way offers more control and reliability than welded, but welded gets the job done. its pretty much about the amount of money you got to invest on a diff. just dont buy a vlsd. open>Vlsd lol