Set of Eight Ford Racing 12mm Thread Cold Spark Plugs for 2008-2010 3V Mustangs.For use in engines with higher than stock cylinder combustion pressures or sustained high rpm. One heat range colder than the stock Mustang GT spark plugs. Fits 2008-2010 3V heads requiring the 12mm thread. All 2009 engines use 12mm spark plugs.
*If you have a 2008 Mustang, you need to determine if you have 2005-2008 "high thread" 16mm spark plugs or 2008-2010 12mm spark plugs. This can be determined by looking at the coil engineering number. If you have a 3L3E number, you have 16mm spark plugs (M124053V0), if you have an 8L3E coil engineering number then use the 12mm this version.
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