When adding a supercharger or turbo to your Mustang you need to run the correct spark plugs. These Ford Racing plugs are 1 head range colder than the stock Mustang GT plugs.
- Fits 2008 and newer 3V heads requiring the 12 mm thread
- For use in engines with higher than stock cylinder combustion pressures or sustained high rpm
- One heat range colder than the stock Mustang GT and 5.4L-3V truck engine spark plugs
- Sold in engine sets of 8
- Use M-12405-3V0 spark plugs for early style 2005-2008 3V heads
- NOTES:
- 2008 engines with late style 12 mm spark plugs can be identified by coil engineering number 8L3E
- 2005-2008 engines with early style 16 mm "High Thread" design spark plugs can be identified by coil engineering number 3L3E part number
- All 2009-2010 engines use 12 mm spark plugs
