New plugs with tune

[MeanKS]

.030, it is working for everyone else so I figured why buck the trend . The factory ones were mostly all .040 so happy I did it.

Your sp534s weren't pre-gapped at .030?

[boostedflex]

They were, I checked them expecting .032 but they were all gapped to .030, sorry for the confusion

[Torsen]

I installed my LMS stage 4 tune a couple weeks ago, and just changed my plugs today.  I installed SP534 plugs gapped to .030.  The plugs I pulled out looked really good, but were gapped to between .047 and .050.  Is that normal?

[Brucelinc]

If you had around 50,000 miles or more on the original plugs, those gaps are not surprising.  The electrodes erode fairly quickly on the original equipment plugs. 

[Torsen]

They are platinum motorcraft plugs. I bought the car with 64k miles, so not sure.