I'm sure this has been discussed before, but I can't find any actual information by doing a search here. I'm in Canada and I normally use Napa Gold 7356 filters. It's hit or miss if I can get Napa to give me a discount if I buy a case of 12 (which they call a Master Pack). I've always heard that Wix actually makes Napa branded filters so it took me some time, but I finally found a Canadian place that sells Wix 57356 filters by the 12 pack case for $77.40, making each filter cost $6.45 CND, which is reasonable to me. My only concern is IF the Wix 57356 is identical to the Napa Gold 7356? I've read many times in this forum and others that Wix has different "levels" of quality, that Wix branded filters are better than the ones they provide to Napa for their Gold filters, and the opposite as well. I also understand that around 2014 Mann + Hummel apparently bought out either the Napa or Wix line....I'm not sure. I just know that if the filter has the Mann + Hummel marking on it that it was at least made post 2014...I think!!?? If anyone has cut open both a Wix 57356 AND a Napa Gold 7356 I'd be most interested to know what you found as far as if they contain identical guts, or if one is better than the other? Also, the place I've found in Canada that sells the 12 pack for $77.40 is called Parts Avatar, which up until I found the web listing I've never heard of. There seems to be good reviews, but I'd also appreciate any comments from others who have maybe used Parts Avatar in Canada with regards to them selling the real items they are claiming to sell and that kind of thing. Thanks in advance for any replies.