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Cummins QSB 6.7L Aftertreatment Device 2011-2020: OEM 4387476

CUMMINS QSB 6.7L AFTERTREATMENT DEVICE 2011-2020: OEM 4387476

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

CORE CHARGE:

$500.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER4387476
PART TYPEAftertreatment Device
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB 6.7L
YEAR2011-2020
PART NUMBER4387476RM-SCR
APPLICATION NOTESTier 4

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Aftertreatment Device, Tamerx part number 4387476RM-SCR ( OEM Part Number 4387476 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins QSB 6.7L, production years 2011-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4387476
Additional OEM4387476, A052R584

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490556188
WEIGHT22.00 LBS

SHIPPING OPTIONS

Ship Weight : 22.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Engineered to handle demanding emissions requirements, the Cummins QSB 6.7L Aftertreatment Device 2011–2020 (OEM 4387476) helps keep your exhaust system operating efficiently. Designed specifically for Cummins QSB 6.7L engines, this integrated aftertreatment component supports proper exhaust gas treatment and dependable emissions control. Manufactured to meet OEM specifications, it delivers precise fitment and reliable compatibility across the listed model years. Installing the correct aftertreatment device helps promote consistent system performance and long-lasting reliability.

FITMENT CHART

YEARMAKEENGINE(S)
2011Cummins QSB 6.7L
2012Cummins QSB 6.7L
2013Cummins QSB 6.7L
2014Cummins QSB 6.7L
2015Cummins QSB 6.7L
2016Cummins QSB 6.7L
2017Cummins QSB 6.7L
2018Cummins QSB 6.7L
2019Cummins QSB 6.7L
2020Cummins QSB 6.7L

PEOPLE ALSO ASKS | BLOG(S)

The Cummins QSB 6.7L Aftertreatment Device 2011-2020: OEM 4387476 is engineered to integrate with the original exhaust emissions system found on compatible Cummins engines. As a complete aftertreatment assembly, it provides an OEM-fit solution for replacing worn or damaged emissions components while maintaining the factory system layout.

  • OEM 4387476 designed for Cummins QSB 6.7L engines from 2011-2020
  • Complete aftertreatment assembly for factory-style replacement
  • Designed to integrate with the original exhaust emissions system
  • OEM-quality construction for accurate fit and secure installation
  • Durable design built for demanding heavy-duty diesel applications
  • Ideal replacement for aging or damaged aftertreatment assemblies

The Cummins QSB 6.7L Aftertreatment Device OEM 4387476 is a dependable replacement option for restoring your truck's exhaust aftertreatment system. Tamerx Diesel Parts offers high-quality OEM-fit diesel emissions components trusted by truck owners and service professionals seeking reliable, long-lasting replacement parts.

An aftertreatment device is a vital part of a modern diesel emissions system, working to reduce harmful exhaust emissions through components such as the DOC, DPF, and SCR. When one or more of these components begin to fail, the vehicle will often display noticeable warning signs. Identifying these symptoms early can help prevent more extensive damage and expensive repairs.

  • The check engine light or an emissions system warning is often the first indication of an aftertreatment problem.
  • Reduced engine power or engine derate mode may occur if the system detects an emissions-related fault.
  • Frequent or unsuccessful DPF regeneration cycles can indicate reduced aftertreatment efficiency.
  • Increased fuel or Diesel Exhaust Fluid (DEF) consumption may result from the system trying to compensate for poor performance.
  • Sluggish acceleration or reduced overall engine performance can occur due to restricted exhaust flow.
  • Excessive exhaust smoke or unusual exhaust odor may indicate that emissions are not being properly treated.
  • Recurring fault codes related to NOx sensors, temperature sensors, pressure sensors, or catalyst efficiency may point to an aftertreatment issue.

A failing aftertreatment device can affect emissions compliance, engine performance, and operating costs. Prompt diagnosis and routine maintenance help restore proper system operation, prevent further damage, and extend the life of the entire emissions system.

Faulty injectors, turbocharger issues, and poor combustion can increase soot production. Over time, these problems can reduce the efficiency of the aftertreatment device.

Yes, serious emissions-system faults can cause the engine control module to limit engine power. This helps protect the engine while maintaining emissions compliance.

Routine engine maintenance, timely oil changes, and prompt repair of emissions faults help reduce soot accumulation. Following recommended service intervals also supports longer component life.

Yes, damaged exhaust pipes or leaking connections can reduce aftertreatment efficiency. They may also cause inaccurate sensor readings and emissions faults.

Cummins Aftertreatment Devices