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The Modular One-Box: Breaking Down the Future of Aftertreatment


In two years as the only aftermarket replacement One-Box manufacturer, the Roadwarrior R&D team has developed our expertise considerably. We’ve expanded Roadwarrior’s design offering to include not one, but four different One-Box models. Recently, we also achieved the challenging technical feat of developing a modular One-Box. The compact, modular One-Box is one system combining a DPF, DOC and SCR; the system can be split into three parts and serviced individually.

‘…The modular One-Box can be split into 3 parts and serviced individually…’


The biggest drawback of current OEM One-Box models is that if one section breaks, you often have to replace the whole system. This is an expensive and time-consuming repair to your heavy-duty engine, that can cause costly downtime and services. A modular One-Box makes future repairs faster and a third of the price, getting you back on the road and back on track.


Why Choose a Modular One-Box?


Roadwarrior offers a modular One-Box

The modular One-Box design has the advantages of our classic Roadwarrior One-Box—the light, compact design freeing up valuable frame-rail space, improved fuel efficiency and lower engine backpressure. Our One-Box design also solves the issue of low NOx conversion efficiency in GHG14 generation OEM One-Boxes. This is a common issue that occurs when DEF builds up in the SCR mixing chamber.

But our modular design comes with other advantages. Over time DPFs experience ash buildup, and it eventually becomes necessary to remove and clean your DPF. The modular design could make this process quicker and easier for your mechanic and for you. This valuable part also increases your truck’s resale value, even if you just sell it for parts.

A One-Box emissions control system is a complicated system. You might think it’s just an added expense and an extra warning light on your dashboard. But from a legal and environmental perspective, an aftertreatment system is essential to your heavy-duty diesel engine. A well-maintained aftertreatment system also benefits your truck.

So, what is an exhaust aftertreatment system and what does it do?


What is a Diesel Oxidation Catalyst (DOC)?

A Diesel Oxidation Catalyst is a honeycomb-structured filter, coated with a catalyst, specially designed to treat exhaust gas. As the exhaust gas passes through, the catalytic converter reacts with hydrocarbons and carbon monoxide to create carbon dioxide and water. At Roadwarrior, our emissions control technology features award-winning Metalcor® technology, improving fuel efficiency and conversion rates. Our Metalcor® DOCs are more durable and more efficient than traditional ceramic catalysts.


What is a Diesel Particulate Filter (DPF)?

After the DOC, the exhaust gas goes through the Diesel Particulate Filter (DPF). The DPF traps soot and particulate matter, which are then burned off by active or passive regeneration (regens). Roadwarrior DPFs use a catalytic coating made from platinum-grade metals. This benefits you because passive regens can happen at lower temperatures. This means that you get longer between active regens, and ultimately enjoy fuel savings.

Regular regens are important because if soot and ash build up, they can clog the DPF. Eventually, this will cause DPF cracking and if that happens you may need to replace the DPF early. We recommend a professional DPF clean after about 200,000 miles to remove accumulated ash and extend its life.


What is Selective Catalytic Reduction (SCR)?


Selective Catalytic Reduction (SCR) is the final stage of the exhaust aftertreatment process. The diesel exhaust fluid injector releases DEF (automotive-grade urea) into the exhaust stream after the DPF. The DEF passes through the SCR and this third catalyst filters the exhaust gas even more. The SCR turns NOx particles into nitrogen and water, which both occur naturally in the air. This three-part system ensures that your diesel engine is both environmentally friendly and compliant with the latest EPA regulations.


Comments (9)

  1. Hi Jeffrey,
    Thanks for getting in touch. For information on the availability of any of our parts, please call 1-877-897-9759 or visit our website http://www.roadwarrior-inc.com with the part number you need to replace.
    – The Roadwarrior Inc. Team

  2. Hi Paul, thanks for checking. Our parts are not CARB certified so we cannot ship to the state of California. Are you happy for us to pass on this email address so a member of the sales team can reach out to discuss your options? If not, you can contact our sales team on 18778979759.

    – The Roadwarrior Inc. Team

  3. Hi Steven, thank you for getting in touch! Roadwarrior parts will not affect your truck’s warranty

  4. Hi Roberto,
    Thanks for getting in touch! The Roadwarrior One-Box comes with the awning DEF kit pre-installed!

  5. I bought a GHG14 one box ..
    Saving more diesel but having a code 3936 after one week ..and nobody can find the right answer..
    Also this roadwarrior box need a awning def kit like the OEM ?
    Thank u

  6. So these do not affect warranties or anything like that? Also, what kind of a wait time is there on them?

  7. […] why For Detroit Diesel engines, we also developed a modular One-Box, which can be split into three separate parts (DOC, DPF, SCR) and serviced or replaced […]

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Better Coating, Better Performance.

Roadwarrior is the only manufacturer to use Metalcor® catalyst technology across its entire range of Diesel Oxidation Catalysts (DOCs) and Selective Catalytic Reduction catalysts (SCRs). Metalcor® catalysts feature high activity catalyst coatings fused to thinner, stronger, catalyst substrates to guarantee maximum performance under the harshest conditions.

Metalcor® catalyst coatings are designed and produced in our own labs. We then inspect each unit to ensure you get more fuel efficiency, lower consumption of DEF, and long term performance from your heavy duty engine!


Roadwarrior Has You Covered!

All Roadwarrior emissions parts carry a full value 12 month warranty.

LightningVolt lithium batteries carry a full value 30 month warranty.

To make the process hassle-free, our parts have a metal nameplate with the serial number, so even after 500,000 miles of service, it’s still easy to identify. This avoids the common problem of serial numbers printed on stickers that burn off after the first start-up, making them impossible to return. Our failsafe system allows us to work in your interests, honouring claims for on-road and off-road replacements, and giving you peace of mind.

And since Roadwarrior parts are designed to meet or exceed OEM specifications, you can rest easy knowing our direct fit parts will take the problems out of your aftertreatment without interfering with your OEM warranty.

Next Day Is Nice, Same Day is Better!​

A faulty emissions control system can cost you thousands in wasted man-hours as your heavy equipment sits in the shop awaiting a new part. Whether it’s a truck behind on orders, a bus that can’t take passengers, or heavy machinery delaying construction deadlines, Roadwarrior can get you moving again! 

Roadwarrior has twelve warehouses across the U.S.A. and Canada, which can deliver the most popular aftertreatment parts in 1-2 days. With over 1,000 DPFs, DOCs and SCRs on offer, Roadwarrior offers the largest aftertreatment catalogue.

*LightningVolt lithium batteries ship directly from Roadwarrior in Ontario, to ALL 50 states, including Alaska and Hawaii within 2-4 days.