So after the first ordered set was never delivered, the second set finally arrived after a week. Seems to be of a good quality stainless steel, but only time will tell. Size? Well, the specs say ID of 2.25. They’re more like 2.5+. We had to create a collar for them in order to fit them to exhaust pipe of 2.25. Whomever is in charge of shipping needs to be better at it.