According to the filter study, the Baldwin flowed better than the Wix and had better filtration. That's not to say that the Wix is not a good filter. The only thing the Wix has over the Baldwin is a silicone ADBV. I just last week spoke to a Wix engineer. According to him, Wix has never had a problem with nitrile ADBVs and went to the silcone ADBVs in demand of the market. It a false perception. I choose a filter that flows better, filters better, and is constructer stronger. According to Wix, who has the silicone ADBV, the silicone ADBV is not necessary. BTW, I can buy the Baldwins cheaper than the Wix as well.