Gasket, Exhaust Manifold Steel 4-Layer (Genuine) - EVO1-9, EVO9 Wagon, Galant VR4 4G63T

Why a 4-Layer Steel Exhaust Manifold Gasket is Required for Turbocharged Engines:

• High Exhaust Temperatures: Turbocharged engines run significantly hotter than naturally aspirated engines, with exhaust gases often exceeding 900°C. A single-layer gasket cannot reliably withstand these temperatures without warping or leaking.

• Increased Exhaust Pressure: The turbocharger creates back pressure in the exhaust manifold. A multi-layer (4-layer) steel gasket provides the strength and flexibility needed to maintain a gas-tight seal under these extreme conditions.

• Thermal Expansion & Contraction: Exhaust manifolds and cylinder heads expand and contract at different rates under heat cycles. The layered steel design absorbs this movement, preventing cracking or blowouts.

• Durability Under Boost: Turbocharged setups place continuous stress on the manifold-to-head joint. The 4-layer gasket distributes clamping force evenly, reducing the risk of leaks that can cause boost loss, power reduction, or exhaust gas leaks into the engine bay.