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IAG Performance Cylinder Head Gasket Cooper Ring Head Gasket EJ25/EJ257, 100mm, .051", 1/2" & 11mm Head Studs (1 Pr)

Engine Cylinder Head Gasket


IAG Cooper Ring Head Gasket for Subaru EJ25 / EJ257, 100mm, .051", for 1/2" and 11mm Head Studs (1 Pair).

  • Unique Fire Rings help contain extreme cylinder pressures.
Pricing: $249.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Subaru: WRX STI 13 - 21 Sport-tech / Tsurugi Edition / Launch Edition / Sport / Base / Limited / Series.HyperBlue / Kanrai Edition / STI / Type RA / S209, Subaru: WRX 12 - 16 Limited / Base / STI, Subaru: Baja 04 - 06 Turbo, Subaru: Outback 05 - 09 2.5 XT / XT Limited / XT, Subaru: Forester 04 - 13 XT Sports / Sports 2.5 XT / XT / XT Premium / XT Limited / XT Touring / 2.5 XT, Subaru: Impreza 04 - 14 WRX STI Special Edition / WRX SE / WRX GT / WRX Premium / 2.5 GT / WRX STI Limited / WRX STI / WRX / WRX Limited / WRX TR, Subaru: Legacy 05 - 13 2.5GT / GT spec.B / GT Limited / GT

  • Do not use with 14mm head studs
  • Gaskets Sold in Pairs
  • If a block or cylinder head was previously o-ringed the groove must be filled and resurfaced before using this type of gasket. Do not use coatings or sprays on the gaskets
  • Install Notes: Groove side of the ring faces up toward the head
  • Use with 11mm, 1/2" head studs only

The IAG Performance Cooper ring head gasket is manufactured from an asbestos-free composite raw material and features silicone based beading applied to critical areas to improve sealing around all water and oil passages. What sets this gasket apart from others is the separate stainless steel rings surrounding the bore holes. The rings assure maximum sealing for a turbocharged engine and the block and head do not require any special machining. The IAG Cooper ring gaskets are designed for high horsepower, high boost applications. The gaskets are not recommended for blocks or heads that are o-ringed. This gasket set is sold as one pair. Features: Composite Material Stainless Steel Ring (AISI304) Silicone Beading 100mm Bore .051" Thickness Intended for High Horsepower, High Boost applications.


  • IAG-ENG-1731P
  • IAG-ENG-1731P
  • 887753777911
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 0.7 lbs.
  • W0.7000” x H0.5000” x L13.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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