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We have a DTE Stage 5 diff 4.10 with the Quaife unit installed. We did a hard one wheel burnout at the PINKS ALL OUT event in Atlanta and knew we were on borrowed time. Phil at DTE recommended the unit and it has performed flawlessly. I can't say we have seen any difference in short times which vary from 1.33 to 1.39 on a good track. We have changed fluid a couple of times and it comes out clear vrs loaded with clutch material. Its good to know its in there and gives us peace of mind as the red car launches pretty hard. Hope this helps.