Restore commercial fleet emissions performance with this premium Skyline aftermarket Cummins 4394578 / A55B956 / 5579360 / A064B994 Diesel Particulate Filter (DPF) Replacement. Also acting as a high-efficiency direct-fit DPF filter alternative, this brand-new wall-flow particulate assembly serves as a direct counter-part to OEM cross-references 4394578, A55B956, 5579360, A064B994, 4394578NX, 4394578RX, 5579360NX, and 5579360RX. Engineered for exact physical proximity within medium-duty commercial vehicles, it installs cleanly with no exhaust system modifications, carries zero core charge, and ships free within the continental United States.

Cummins 4394578 Cross Reference

How to Verify Your Unit: This direct-fit particulate filter replaces components stamped with housing, casting, or manufacturing tags matching any of the interchangeable assembly numbers or supplier cross-references listed below:

Choose Your Kit Configuration

Select the setup from the product options above that best fits your shop's needs:

• Full Kit (Best Value): Includes (1) Brand-New Component, (2) installation gaskets (2871772), and (2) heavy-duty clamps (5417471).
• Component Only: Includes core unit only. Hardware items excluded.

Key Features & Specifications for Part 4394578 / A55B956

• Proudly Built in the USA: Designed, engineered, and manufactured in America.
• No Core Charge: Brand-new aftermarket component; completely eliminates dirty core tracking and return hassles.
• Exact-Fit™ Technical Dimensions: Built with matching inlet/outlet outer diameters, pre-machined sensor ports, and specialized body hanger brackets for zero exhaust system modifications.
• Substrate Performance Matrix: Advanced flow-through wall-flow honeycomb core features optimized precious metal washcoat loading to maintain optimal exhaust temperatures and long-term emission control.
• Industry-Leading Warranty: Backed by an extensive 3-year unlimited mileage coverage matrix.
• EPA Compliant: Meets federal emissions standards for applicable particulate matter reduction requirements nationwide.
• Fast Free Shipping: Free ground freight within the continental United States. Orders confirmed before 2:00 PM Eastern ship out the same business day.

Cummins Vehicle Fitment Guide

Direct alternative solution for approximately 2017 to 2025 model year vehicles running commercial transportation, medium-duty logistics, and vocational architectures with horizontal chassis exhaust configurations. Deployed widely across standard Class 6, Class 7, regional box lines, delivery trucks, municipal frameworks, and passenger fleets:

• Engine Platforms: Cummins B6.7 (ISB 6.7L platform), Cummins L9 (ISL 9L platform), and PACCAR PX-9 medium-to-heavy duty applications.
• Kenworth Applications: Conventional medium-duty series trucks including Kenworth T280, T380, T480, and vocational heavy layouts like the T880 running the L9 engine block configuration.
• Freightliner Applications: Medium-duty box and regional distribution configurations including Business Class M2 106, M2 112, and Cascadia models running the 8.9L platform core under number 4394578.
• Peterbilt Applications: Regional distribution and city delivery vehicle models including vocational frames 536, 537, 548, and 567 series setups matching element code A55B956.
• International / Navistar Applications: Work-ready fleet configurations matching vehicle setups for MV Series and HV Series truck networks.
• Vocational / Bus Fleet Systems: Heavily optioned across municipal refuse trucks, regional dump trucks, transit fleets, shuttle configurations, and commercial school bus layouts.

Compatible Master OEM Assembly Reference Codes: 4394377, 5508142, 5508143, 5508144, 5508145, 5508147, 5508149, 5508150, 5508151, 5508153, 5508154, 5508296, 5508290, 5508300, 5508303, 5508304, 5508305, 5508306, 5508307, 5508389, 5508390, 5508397, 5508398, 5508399, 5508402, 5508403, 5508451, 5508452, 5508453, 5508456, 5508458, 5508459, 5508460, 5508461, 5508462, 5508473, 5508485, 5508486, 5508488, 5508504, 5508507, 5508555, 5508557, 5508558, 5508560, 5508564, 5508565, 5508566, 5508613, 5508614, 5508615, 5508664, 5508666, 5508667, 5508691, 5508692, 5508693, 5508694, 5508695, 5508696, 5508697, 5508698, 5508700, 5508705, 5508706, 5508707, 5508708, 5508797, 5508798, 5508799, 5508800, 5508801, 5508802, 5508803, 5508804, 5508805, 5508807, 5508809, 5508810, A054U225, A062N995, A062P012, A062P013, A062R426, A062R434, A062R435, A062R436, A062R439, A062R440, A062R445, A062R450, A062R464, A062R465, A062R466, A062R467, A062R471, A062R472, A062R479, A062R483, A062R484, A062R485, A062R486, A062R488, A062R494, A062R502, A062R503, A062R505, A062R507, A062R508, A062R509, A062R510, A062R511, A062R512, A062R518, A062R519, A062R521, A062R523, A062R525, A062R526, A062R527, A062R528, A062R532, A062R534, A062R537, A062R543, A062R547, A062R549, A062R551, A062R552, A062R554, A062R555, A062R557, A062R560, A062R561, A062R563, A062R564, A062R568, A062R572, A062R573, A062R575, A062R576, A062R577, A062R584, A062R586, A062R589, A062R591, A062R592, A062R598, A062R601, A062R603, A062R604, A062R606, A062R607, A062R610, A062R612, A062R613, A062R614

Signs Your Diesel Particulate Filter (DPF) Needs Replacement

• Frequent, unprompted, or incomplete DPF regeneration cycles triggered by active trouble codes matching 4394578 / A55B956
• Excessive particulate soot face-plugging or heavy face mask scaling across the internal filter core face assembly
• Active dashboard diagnostic trouble codes (DTCs) pointing directly to poor particulate conversion or filter cracking
• Unexplained commercial engine backpressure spikes or noticeable horsepower deterioration under loaded trailer pulls

*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped part number on your filter unit casing before placing an order.

Disclaimer: Product images for reference only. Hardware depends on configuration. Price is for (1) unit. Inventory levels are subject to local availability updates. Selecting the "Full Kit" option adds the explicitly listed installation components to your shipment.