Big Boss Exhaust Manifold ISM Non-Coated

This uncoated PDI Big Boss exhaust manifold collects exhaust from Cummins ISM cylinders and directs it to the turbocharger. It replaces the manifold at the engine’s exhaust ports and provides the connection between the cylinder head and turbo system.

The manifold joins the separate exhaust-port outlets into the turbo’s incoming gas path. A sound manifold keeps that route sealed, making it a replacement option when the original casting or connections are damaged.

Product details

• Finish: non-coated.
• Cast from high-silicon, molybdenum-alloyed ductile iron (HSMD).
• Port design is developed and tested to balance exhaust flow toward the turbocharger.
• Revised mounting-surface design.