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its easy...a 1.5 way diff does not lock under decel which gives you better turn in and less understeer for stuff like autocross and time attack...a 2 way diff locks under decel which either makes you understeer going into the corner or pitches the ass end way out for drifting...if you do anything other than drifting go with the 1.5 way...as far as daily driver you dont need either. Go get a VLSD or a helical...clutch type diffs are a waste of money if you dont track your car.
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