IAG Performance IAG M10 Copper Exhaust Nuts (Pack of 6).

These copper exhaust nuts are designed to replace the OEM exhaust nuts at the Subaru manifold to cylinder head location. The copper nuts are ovalized and feature a broad flange for improved clamping force. The pack of 6 copper nuts fits Subaru EJ20, EJ25, and FA20 applications. Universal style fitment for Subaru WRX STI