I have had Detroit Lockers in axles before and they are NOT streetable. I think a Detroit is a bit more aggressive than a posi unit but like Roger said if it is engaged around a corner you will get noise and/or tire chirping. The growling noise would be the strain on the posi as the inside tire tries to turn faster than the outside tire. The additive for a posi unit is mainly for clutch wear purposes from I have been told. Hope that helps.??
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