Fitment Information

• Subaru WRX (2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014) 
• Subaru WRX STI (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021)
• Subaru WRX Limited (2006, 2007)
• Subaru WRX Premium (2009)
• Subaru WRX GT / WRX SE / WRX STI Special Edition (2010)
• Subaru WRX STI Limited (2011, 2012, 2013, 2014)
• Subaru WRX STI Launch Edition (2015)
• Subaru WRX STI Limited (2015, 2016, 2017, 2018, 2019, 2020, 2021)
• Subaru WRX STI Series.HyperBlue (2016) 
• Subaru WRX STI Sport / Subaru WRX STI Sport-tech (2017, 2018, 2019, 2020)
• Subaru WRX STI Type RA (2018)
• Subaru WRX STI STI (2018, 2019, 2020)
• Subaru WRX STI S209 (2019)
• Subaru WRX STI Kanrai Edition (2020)
  
  • Fits car models with EJ25, FA20, and FA20 DIT Engine

Note

• Requires drilling and tapping.

Specs & Features

• Stud Diameter: 1/2 inch
• Prevents Head Lift
• High Horsepower Support
  
• Increased Clamping Force
  
• 12 months manufacturer’s warranty

Product Description

The IAG Performance 1/2 Inch Head Stud Set is manufactured by ARP and is designed for use on high horsepower EJ25, FA20, and FA20 DIT engines. Due to the larger size of the head studs, a greater load can be placed on the fasteners and in turn it aids in preventing cylinder heads from lifting in race applications. The larger size of the head studs requires the case halves to be drilled and tapped. The cylinder heads will also require drilling to accept the larger studs.