Perfect for stock boost
Improves fuel economy and lower emissions
Heat Range: 6
NGK part# TR6; NGK stock# 4177
14mm thread pattern
Spark plug reach 0.690"
Fits: 1996-2004 Mustang GT / 2003-2004 SVT Cobra and 2007-2014 Shelby GT500
** Note : we recommend a gapping of 0.028-0.035 for force induction applications.
Sold as a set of 8
Blow-By Racing is not responsible for any prices changes, mis-mark items , or any other mis-printed items.