This Turbo XS multi-layer steel exhaust manifold-to-header gasket is made for Subaru EJ20 and EJ25 applications and sold as a pair. It uses MLS construction with a stainless fire ring to improve sealing against flange surfaces and help keep exhaust gases where they belong. The gasket is specified at 1.25 mm thickness across layered stainless construction for a durable seal.
Turbo XS Subaru EJ20/EJ25 4-Layer Stainless Steel Exhaust Manifold to Header Gasket - Pair