Me and my buddy ordered uni-filters for our XP’s from the same dealer on the same day 2 weeks ago. we got them last Thursday and put them in for a poker run this past Saturday. As we were oiling them we noticed that one had a foam ring around it and the other one did not. Same part number on the filter and the bag on both filters. We took a tape measure and dial caliper to them and the stock filters and the one without the foam ring was exactly the same size as the OEM filter. I put that one in mine and he ran the one with the foam, it was a little tricky to get it in the box but we got it. So my first question is what’s up with them being different with the same P/N? And second did anyone else feel it actually hurt performance? Me and him both felt it hurt our performance.