In my personal situation, it is much easier for me to order filters from Bavarian Autosport, Turner Motorsports and so on. I order about 3 at a time and 1 air filter and never have to go to the dealer. The only reason I did this is because I was under the impression that Mann filters were equal to OEM filters. If they aren't, then I will make that trip to the dealer. I would like to see any info comparing Mann to OEM if anyone has it though.