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I would worry about mgn warranty as if they thought it was better they would offer them. not having to have some after market doing it. And what I see around here working in these tire places they are low pay and change people all the time. I have never had a tire place around here ever mention sipping. I see the big commercial tires having those sips but they are coming from the maker of them. The ones I see that we use on the school buses that is. I am not saying sipping not good, just that having other then the manufacturer do it. I would think give the tire company grounds to void warranty. Can they be ordered with the sipping from factory?
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