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Cummins QSB 4.5L - 173 Turbo Assembly 2015-2022: OEM 5321671RX

CUMMINS QSB 4.5L - 173 TURBO ASSEMBLY 2015-2022: OEM 5321671RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$5,850.00

CORE CHARGE:

$1,200.00
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 NUMBER5321671RX
PART TYPETurbo Assembly
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB 4.5L - 173
YEAR2015-2022
PART NUMBER5321671RM-WA
APPLICATION NOTESToyota

PRODUCT DESCRIPTION

This is a New, Tamerx Turbo Assembly, Tamerx part number 5321671RM-WA ( OEM Part Number 5321671RX ).This part is primarily made for a Cummins QSB 4.5L - 173, production years 2015-2022, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5321671RX
Additional OEM5321671NX, 5321671RX, 536276, 5326280, 5502908

ADDITIONAL DETAILS

CONDITIONNew
UPC / Barcode00840490542235
WEIGHT28.00 LBS

SHIPPING OPTIONS

Ship Weight : 28.00 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.


Ignite peak performance with the Cummins QSB4.5-173 Turbo Assembly (2015-2022), OEM 5321671RX — precision-balanced for instant boost, sharper response, and durable power. Meticulously remanufactured to OEM standards, this turbo helps restore engine vigor, reduce lag, and push your machine to new levels of efficiency and strength. Upgrade it, love the ride.

FITMENT CHART

YEARMAKEENGINE(S)
2015Cummins QSB 4.5L - 173
2016Cummins QSB 4.5L - 173
2017Cummins QSB 4.5L - 173
2018Cummins QSB 4.5L - 173
2019Cummins QSB 4.5L - 173
2020Cummins QSB 4.5L - 173
2021Cummins QSB 4.5L - 173
2022Cummins QSB 4.5L - 173

PEOPLE ALSO ASKS | BLOG(S)

The turbocharger is the heart of your engine’s breathing—and for the Cummins QSB4.5-173 (2015–2022), using the correct OEM 5321671RX turbo assembly ensures that heart functions optimally. This isn’t just about boosting airflow; it’s about preserving engine balance, emissions compliance, and longevity. A mismatched or worn turbo can lead to lag, smoke, poor fuel economy, and costly repairs down the road.

  • Designed specifically for the QSB4.5-173’s airflow and pressure needs, delivering the right boost curve

  • Maintains proper compressor and turbine tolerances to avoid surge, stall, or excessive backpressure

  • Helps curb black smoke, exhaust temperature spikes, and turbo lag that arise from degraded or incorrect units

  • Built to OEM specs (5321671RX / 5321671NX / related cross numbers) for reliable fitment and compatibility

  • Supports emissions compliance by enabling precise combustion, mitigating unburned fuel or soot

  • Fully balanced and tested to reduce vibration, wear, and premature failure

Your turbo is doing critical work every second your engine runs. Installing the correct OEM 5321671RX turbo assembly restores your engine’s breathing efficiency, protects your aftertreatment system, and keeps your QSB4.5-173 running strong and clean—not just today, but for the long haul.

A turbocharger is built to handle high speeds, heat, and pressure, making it a durable part of modern diesel and gasoline engines. However, like any mechanical component, it has a limited lifespan. Understanding how long a turbo assembly typically lasts—and what factors influence its durability—can help drivers and operators plan for maintenance and avoid costly failures.

Average Lifespan of a Turbo Assembly

  • Normal Operating Conditions
    A well-maintained turbo can last anywhere from 100,000 to 150,000 miles, with some lasting even longer.

  • Driving Habits
    Aggressive acceleration, heavy towing, or frequent stop-and-go driving can shorten turbo life.

  • Maintenance Practices
    Regular oil changes with high-quality oil are critical since the turbo relies on constant lubrication.

  • Environmental Factors
    Dusty, hot, or extreme operating environments may accelerate wear on the bearings and turbine blades.

  • Engine Care
    Allowing the engine to idle briefly before shutdown helps prevent oil starvation and overheating, both of which can damage the turbo.

  • Warning Signs of Aging
    Blue smoke, whining noises, or reduced engine power often indicate the turbo is wearing out.

A turbo assembly is designed for longevity, often lasting well over 100,000 miles with proper care. Its lifespan depends heavily on maintenance, driving style, and operating conditions. By following recommended service intervals, using clean oil, and protecting the engine from extreme stress, you can maximize the life of your turbo and keep your vehicle running at peak efficiency.

Whining or whistling noises, excessive smoke, oil leaks, or reduced performance are warning indicators.

It should be examined during major engine service or whenever boost or performance complaints arise.

Yes — broken turbo pieces or oil starvation can lead to serious engine damage or contamination.

Regular oil changes, clean filters, proper warm-up and cooldown, and avoiding foreign object ingestion all help.

Cummins Turbo Assemblys

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