Product Description
NGK TR8IX Iridium Spark Plugs
Sold individually.
For a general rule of thumb, we normally recommend NGK TR8IX spark plugs gapped .022 for GT500's running 20+ psi boost, but always consult your tuner when deciding what plug and gap to run.
Fits:
- 2007 Shelby GT500 5.4L
- 2008 Shelby GT500 5.4L
- 2009 Shelby GT500 5.4L
- 2010 Shelby GT500 5.4L
- 2011 Shelby GT500 5.4L
- 2012 Shelby GT500 5.4L
- 2013 Shelby GT500 5.8L
- 2014 Shelby GT500 5.8L
