Cometic C4177-030 MLS Exhaust Manifold Gasket for Nissan RB20/RB25 Engines

The Cometic C4177-030 is a high-performance Multi-Layer Steel (MLS) exhaust manifold gasket engineered specifically for Nissan RB-series engines, including RB20DE, RB20DET, RB25DE, and RB25DET applications. This gasket provides superior sealing reliability in demanding turbocharged and naturally aspirated performance environments.

Key Features:

• Multi-Layer Steel (MLS) construction for maximum durability and heat resistance
• 0.030-inch thickness for precise sealing and proper manifold spacing
• Port dimensions: 1.575 inches x 1.340 inches, optimized for RB-series exhaust ports
• Superior blowout resistance compared to traditional composite gaskets
• Handles extreme temperatures and pressure cycling from turbo applications
• Maintains consistent clamping load through thermal expansion and contraction

Cometic MLS gaskets feature multiple layers of stainless steel with advanced coating technology that allows the gasket to recover and seal surface imperfections. This makes them ideal for both stock replacement and high-performance builds where exhaust manifold sealing is critical to prevent leaks and maintain optimal engine performance.