These cold plugs will fit 2005-2008 Mustang GT 4.6L 3V heads requiring the 16 mm thread. They are to be used in engines with higher than stock cylinder combustion pressures or sustained high rpm. They are uniquely designed is proprietary to Ford 3-valve engines. One heat range colder than the stock Mustang GT plug. Two heat ranges colder than the stock 5.4L-3V truck engine plug. Sold in engine sets of 8.
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