Plug Upgrade Question...

[Johan]

Hello, I have a 2018 and want to replace the plugs, 34k miles, Goosetuned Stage 1 and installing a CVFab intercooler today.
I purchased the Ford Performance M-12405-35T but see some people on here recommend the Motorcraft SP542's.
Should I stick with the ones I got or is there any benefit to the sp542's over the ones I got? Or is the difference negligible?
I live in S. Florida so warmer climate if that matters, thanks for any input.

 

[thatJeepguy]

I Have the ford perf 12405 installed now . They work great.

 

[nikhsub1]

The M-12405-35T is the new SP542 as they aren’t made anymore AFAIK.

 

[Johan]

Ok thank you, that makes sense as they were hard to find online, the sp542's that is.

 

[nikhsub1]

Ok thank you, that makes sense as they were hard to find online, the sp542's that is.

FYI I did a whole deep dive on the plugs and the change from old part numbers to new part numbers 3 years ago during lockdown...

FYI SP-542 successor is NOT the SP-578

Went down this rabbit hole while on lockdown. The SP-578 is now the OEM plug for our trucks that is one step HOTTER than the old SP-542. The revised colder plug is now part number M-12405-35T, I don't believe there is an SP# associated with them anymore. The plugs are redesigned, have thinner...

www.fordraptorforum.com

 

[hingedthinker]

I just ordered from Goose Tuned this past week and they sent me the 35T, cold spark.

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