IAG 550 Street Cylinder Heads Package

• 2004–2013 Subaru | Forester XT
• 2002–2014 Subaru | WRX
• 2004–2021 Subaru | WRX STI
• 2005-2009 Subaru | Legacy GT

The IAG Performance 550 Street Cylinder Heads Package for the 2002-2014 Subaru WRX, 2004-2021 Subaru WRX STI, 2005-2009 Subaru Legacy GT and 2004-2013 Subaru Forester XT is designed to function as an entry-level replacement for stock OEM heads, and works great for cars with basic bolt-on parts up to 550 BHP.

• Part Number: IAG-ENG-H550NL
• Designed as an entry-level replacement for stock OEM heads — a solution if your engine has suffered a catastrophic failure which requires replacement of your cylinder heads, or if you do not have OEM heads to start with
• Includes upgraded GSC standard size valves, GSC Viton valve stem seals, IAG Stage 1 valve springs with titanium retainers, and OEM keepers
• GSC S1 camshafts are available with OEM valve lifter buckets
• An optional chamber modification service is offered for EJ20 heads to allow use on EJ25 short blocks
• Power rating: the IAG 550 Cylinder Heads are designed for cars with basic bolt-on parts up to 550 BHP

Q: Does this fit my Subaru?

A: This cylinder head package, part number IAG-ENG-H550NL, is listed for the 2002-2014 Subaru WRX, 2004-2021 Subaru WRX STI, 2005-2009 Subaru Legacy GT and 2004-2013 Subaru Forester XT applications on this page. The correct castings are selected by year and model, so confirm your exact year and model before ordering.

Q: What is included in the box?

A: The IAG 550 head package includes the cylinder heads with GSC standard size valves, GSC Viton valve stem seals, IAG Stage 1 valve springs with titanium retainers, and OEM keepers.

Q: What power level do these heads support?

A: The IAG 550 Cylinder Heads work great for cars with basic bolt-on parts up to 550 BHP.

Q: Do I need the chamber modification service?

A: The chamber modification service is offered for EJ20 heads to allow use on EJ25 short blocks; it applies only when EJ20 heads are used on an EJ25 short block.

Review our Shipping Policy for delivery details, shipping costs and exclusions.

Eligibility, exclusions, applicable fees and exceptions are detailed in our Return Policy. Restrictions apply to special-order and custom products.

Proposition 65 Warnings: cancer and reproductive harm www.p65warnings.ca.gov