Product Overview
Aftermarket DOC Replacement for Cummins 4328760 / 4353257 / 5302735 / A043U500 DOC
Interchangeable Component Configurations: 4328760 | 4353257 | 5302735 | A043U500 | XN0621
Restore emissions performance with this premium Skyline aftermarket Cummins ISX 4328760 / 4353257 / 5302735 / A043U500 DOC Inlet Module Replacement Kit. This brand-new Diesel Oxidation Catalyst (DOC) serves as a direct-fit alternative to high-traffic OEM numbers 4328760, 4328760NX, 4328760RX, 4353257, 4353257NX, 4353257RX, 5302735, 5302735NX, 5302735RX, A043U500, A047V455, and A042M051. Engineered as an exact-fit replacement for heavy-duty EPA13 emissions modules running Cummins ISX engine platforms, it requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.
OEM CROSS REFERENCE INTERCHANGE MATRIX
Instant Fitment Verification: This direct-fit replacement diesel oxidation catalyst replaces components stamped with housing part numbers, casting tags, or serial plates matching any of the interchangeable manufacturing references listed below:
| Manufacturer | Cross Reference Part Numbers |
|---|---|
| Cummins OEM | 4328760, 4328760NX, 4328760RX, 4353257, 4353257NX, 4353257RX, 5302735, 5302735NX, 5302735RX, A043U500, A047V455, A042M051 |
| Skyline Aftermarket | XN0621, XN0621-M, XN0621-C |
| Roadwarrior Alternative | C0126-ID |
| Dinex Emissions | 58056 |
| DuraFit Alternative | C20-0057 |
| Global Reference | GESi-553 |
| FSS Aftermarket | XN0621-FSS |
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 Oxidation Catalyst, (1) 2871453 and (1) 2866337 OEM-quality flange gaskets, and (1) 2871863 and (1) 2880483 heavy-duty hardware alignment clamps.
- DOC Only: Includes the replacement oxidation module core only. Service gaskets and mounting clamps are not included.
TECHNICAL SPECIFICATIONS
| Material | Premium Stainless Steel |
| Weight | 59.54 lbs (27.03 kg) |
| Length | 12.80 inches (325.12 mm) |
| Core Diameter | 13.14 inches (334.00 mm) |
| Overall Dimensions (W x H) | 13.15 x 13.15 inches (334.00 x 334.00 mm) |
| Exhaust Emission Norm | EPA13 Compliance Certified Matrix |
KEY FEATURES & SPECIFICATIONS FOR PART 4328760 / 4353257 / 5302735
- Proudly Built in the USA: Designed, engineered, and manufactured in America.
- No Core Charge: Brand-new aftermarket element; eliminates core handling logistics, core return freight fees, and bank tracking delays.
- Exact-Fit™ Technical Dimensions: Formed with OEM-matching catalytic sizing, accurate sensor bung depths, and rigid factory-spec indexing pins for drop-in aftertreatment section swap without custom fabrication.
- Advanced Washcoat Substrate: High-performance flow-through catalyst core allows proper exhaust temperature generation to support clean DPF passive regeneration downstream.
- Industry-Leading Warranty: Backed by a 3-year unlimited mileage warranty on all Skyline aftermarket solutions.
- EPA Compliant: Meets federal emissions standards for legal installation on over-the-road equipment.
- Free Shipping: Free ground shipping within the continental United States. Orders submitted before 2:00 PM Eastern ship out the same business day.
VEHICLE FITMENT GUIDE
Direct alternative solution for heavy-duty over-the-road equipment configured with compatible aftertreatment platforms from approximately 2013 to 2016 model years. Optimized for:
- Engine Platforms: Cummins ISX and ISX15 heavy-duty diesel engine blocks operating under active over-the-road applications.
- Chassis Fitments: This high-volume inlet module layout drops securely into frame attachments across major Class 8 fleet configurations: Freightliner (Cascadia/Coronado), Kenworth (T660/T680/W900), Peterbilt (389/567/579), and International highway tractor assemblies matching lookups.
SIGNS YOUR DIESEL OXIDATION CATALYST (DOC) NEEDS REPLACEMENT
- Inability to initiate or complete manual parked DPF regenerations due to low face temperature across code sets 4328760 / 4353257 / 5302735
- Raw unburned fuel dripping from exhaust joints or visual engine exhaust face oil fouling at the internal module inlet face
- Active dashboard diagnostic trouble codes (DTCs) reporting low catalyst efficiency or abnormal upstream sensor readings
- Unexplained increase in downstream DPF soot plugging frequency due to catalyst washcoat breakdown
*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped OEM part number on your catalyst module casing before placing an order.
FREQUENTLY ASKED QUESTIONS
Is there a core charge for this aftermarket emissions unit?
No, this is a 100% brand-new aftermarket component. Unlike remanufactured factory units, there is absolutely zero core charge, zero tracking paperwork required, and no need to spend money shipping your old, dirty unit back to us.
Does this replacement unit come with the necessary clamps and gaskets?
When you select the "Full Kit" option from the dropdown on this page, all exact-fit installation gaskets and heavy-duty alignment clamps required for installation are bundled and shipped directly with the assembly. Selecting the component-only option provides the bare unit without hardware.
How fast will my order ship out?
Orders confirmed before 2:00 PM Eastern standard time ship out from our closest regional fulfillment hub on the exact same business day. Free standard ground shipping is included to the continental United States, and expedited overnight air choices can be selected directly at checkout.
How do I verify this aftermarket filter matches my truck's setup?
You can verify fitment by identifying the original casting, housing, or tag stamp directly on your factory exhaust unit canister shell. If that number matches any of the cross-references listed on this page, or if your engine model and year line up with our application guide, it will bolt directly in with a perfect factory alignment.
Disclaimer: Product images for reference only. Final replacement hardware items matching OEM parameters such as gaskets, clamps, and sensor ports depend on your kit configuration. Selecting the "Full Kit" option adds the explicitly listed installation components to your shipment. Price is for (1) DOC.
