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The Big Boss tuner combined with our high performing exhaust manifold delivers power while allowing better exhaust flow from the engine
HSM Exhaust Housing
and durability
One Piece Seamless Sleeve Gaskets
Precision working components
PDI Big Boss Cummins ISX DOHC Stage 2 Cylinder Head Cylinder Head The Big Boss tuner combinedAvailable for: 1999 2009 Cummins ISX Engines Key Benefits High Nickel Casting Inconel Exhaust and Intake Valves Stainless Steel Fire Ring Enhanced Airflow and Combustion Chambers Made in the USA Warranty: 2 Year Unlimited Mileage PDI Big Boss Cummins ISX Stage 2 Cylinder heads are meticulously designed to surpass the most demanding expectations, making them the perfect choice for heavy duty applications in trucking, construction, agriculture, and
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