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Our viscous torsional damper is a design that consists of a free rotation inertia ring surrounded by a viscous silicone fluid enclosed in a laser welded
Chrome cover dresses up DEF tank to match your polished fuel tanks
Available for: Cummins ISX and X15 Engines 1999-2024
Improved Exhaust and Intake Valves
PDI Big Boss Performance Radiator | Peterbilt 389 Cylinder Head Our viscous torsional damper isPDI Big Boss performance radiators for Peterbilt 389 models feature a premium tube design to allow coolant more time to cool properly for more demanding applications. When combined with higher fin count and more efficient cores, PDI radiators increase cooling capacity 15 20% over OEM. Size and Fitment is direct replacement for simple installation. Constructed of quality aluminum cores with plastic tanks to ensure no tank corrosion and efficient
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