Well I guess I'll throw my 2 cents in here. In the 27 plus years that I've been driving, racing my GN I've tried quite a bunch of different brands of filters. A/C Delco years ago when they were a pretty good filter, Mobil 1, Wix, K&N ,
Purolator, Napa gold, and have ran Baldwin B-9 for years. I had many, many of my oils analyzed and didn't see much if any difference in these filter brands. BUT check out the K P engineering billet aluminum reusable filter.
I have just started running it so have no feedback of my own right now but ALOT of the Buick guys running them swear by them ?