Ryco still have their testing facility in Sunshine and proud of the work it does checking their overseas suppliers product before it reaches the market. They also check on other importers and product in the market. The weight of a filter is not always an indication. The metal thickness and material may confuse you. It is the inside design and filtration material that determines the effectiveness of a filter. As Ryco are a major player in the aftermarket they can test, check and compare ALL filters. In most cases they have something identical and can cross reference it. If not, and there is a potential for sales, they can send it to one of their suppliers to reverse engineer it.
Firstly they would take a series of test readings and record them. Then cut open the original filters and check the materials and design. Then make up a new filter to match the original. Eventually you have a similar and competitive product in the market, often at a lower price than the Car Companies spare parts department. That allows the customer freedom of choice. With buying locally you can take a product back if it doesn't meet expectations where something ordered on line is not so easy to replace and no guarantee you are getting the correct item
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