Lot of speculation from you so called experts,lol. It's a well designed cover with at least a little thought put into making it actually functional. I like the fact it mimics the factory covers oiling channel,where as nobody else's covers do.I'm guessing the manufacture's have way more into engineering their covers to keep the rear diff happy and off warrenty then the majority of aftermarket cover manufacture's do. I've never been a fan of the aftermarket covers till this one,as anybody with an eye and an ******* can see they don't address oil flow to the front pinion bearing like a stock cover does.As I stated awhile ago,i'm wondering how long it takes the other guys to retrofit an oil channel into their covers