I have them as well on my N54 and with time I am starting to think that these are way better quality than OEM. OEMs I was going through quite often back in the day. However, I've also started using gapped NGK plugs which alleviate some of the strain on the ignition system so that may be helping it as well. Power wise I can't say these are helping over OEM just yet but at the same time I've never done a before/after.