What kind of spark plugs is everyone running?

Mustang5L5 said:

True copper is better, and silver plugs would be even better (not made for Mustang yet)

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RandyStinchcomb said:

ummm, better look again as there is NO such Motorcraft sparkplug # as a AGSF-12C.. ......now there are AGSF-12-FM's which is a "fine wire" plug used in the '03/04 Cobra's and Lightning's........ then there is a AWSFA-12-C used for the "flex-fuel" cars, but the "AW" series plugs are ONLY a 1/2 thread design, not a "full thread" like the "AG" series and Motorcraft has NO plans att to change the AWSFA-12-C to a full thread design.........

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CobraRed_96_GT said:

ahh yes, good catch there - but there is a platnum/iridium fine wire that is AGSF-12F-M1's and a double platinum AGSF-12 EE's. Im not even sure if im going to go with a 12 yet, poly end up using a 22 which would make me use a AWSF-22C.

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RandyStinchcomb said:

well, no...AWSF-22C's which is a 1/2 thread design sparkplug were discontinued about a year ago....the replacement plug for the "AWSF" is the "full thread" design sparkplug "AGSF"....so to keep things straight here, you'll need a AGSF-22-C sparkplug

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