Used Truck Mufflers, Silencers & Aftertreatment Exhaust Boxes

Used truck mufflers, silencers & aftertreatment exhaust boxes

Mufflers and silencers are the main noise control components in a truck exhaust system. Exhaust gases leaving the engine are hot and noisy, so they pass through a silencer box that uses chambers, baffles and perforated tubes to reduce sound levels before the gases exit to atmosphere. On modern Euro 5–6 trucks, the silencer is often combined with aftertreatment elements such as DOC, DPF and SCR, forming a large aftertreatment exhaust box mounted on the chassis.

In this category we list used OEM truck mufflers, silencers and SCR/DPF exhaust boxes removed from late-model European lorries. Typical examples include DPF/SCR silencer assemblies for MAN TGX/TGS Euro 6 and DAF XF106/CF Euro 6, supplied complete with OEM numbers and detailed photos so you can match them to your truck.

What you will find in the Mufflers/Silencers category

Stock in this category changes as new donor vehicles arrive, but it typically includes:

• main exhaust silencers for tractor units and rigids, with inlet and outlet positioned for specific chassis layouts;
• combined SCR/DPF mufflers where diesel oxidation catalyst, particulate filter and SCR system are built into one aftertreatment box;
• Euro 5–6 silencer boxes with heat shields, mounting brackets and integrated temperature / pressure sensor ports;
• silencers designed for side-mounted or vertical stack exhaust configurations;
• selected noise insulation and acoustic panels associated with exhaust silencers, where supplied as part of the system.

Each product listing shows the donor vehicle details, OEM part numbers and clear images from multiple angles so you can compare case shape, inlet/outlet orientation, bracket positions and sensor bosses with the unit on your truck.

Truck brands & typical applications

Most mufflers and silencers we stock come from mainstream European heavy trucks, including:

• DAF XF and CF series Euro 5–6;
• MAN TGS and TGX tractors and rigids;
• Volvo FH and FM Euro 5–6;
• Mercedes-Benz Actros / Arocs and related models;
• occasional stock for Scania and other makes.

These are genuine OEM exhaust silencers and aftertreatment boxes, similar to those offered by specialist truck exhaust suppliers for Volvo, DAF and other brands, designed specifically for heavy-duty commercial applications.

How mufflers & silencers work in heavy-duty exhaust systems

The muffler (or silencer) uses internal chambers and perforated tubes to slow down exhaust gases and cancel out sound waves, which significantly reduces the noise generated by the engine. At the same time, the exhaust system carries combustion gases away from the cab area to keep drivers and passengers safe from fumes.

On modern Euro 5–6 trucks, the silencer box also houses one or more aftertreatment elements:

• a diesel oxidation catalyst (DOC) to treat hydrocarbons and CO;
• a diesel particulate filter (DPF) to trap soot;
• an SCR section where AdBlue/DEF is injected to reduce NOx emissions.

Correct silencer and aftertreatment configuration is essential to keep noise within legal limits, maintain engine performance and ensure emissions compliance for roadworthiness and MOT tests.

Typical signs of muffler or exhaust box problems

Common symptoms that may indicate a faulty muffler or aftertreatment box include:

• increased exhaust noise or a “blowing” sound from the silencer area;
• visible cracks, rust or holes in the silencer casing or welds;
• soot marks around joints or on the outside of the box, indicating leaks;
• exhaust fumes smell near the cab or chassis where the system should be sealed;
• emissions-related fault codes if internal damage affects DPF/SCR performance.

If any of these issues appear, the exhaust system should be inspected by a professional workshop to identify damaged sections and check for further problems in the aftertreatment system.

How to choose the correct muffler or silencer assembly

To make sure you order the right exhaust silencer or SCR/DPF box for your truck, always check:

• OEM part number on the old muffler (truck OE code and any supplier numbers);
• truck brand, model, engine type and Euro class – for example DAF XF106 Euro 6, MAN TGX D26 Euro 6, Volvo FH4, Mercedes Actros MP4;
• layout & orientation – side-mounted or vertical stack, left or right side, under-cab or chassis-mounted position;
• inlet/outlet positions and diameters, including the type of flanges or clamps;
• bracket positions and mounting points on the chassis rails or crossmembers;
• presence and location of temperature, pressure and NOx sensors and AdBlue injector ports on SCR/DPF units.

If you are unsure, you can contact us with your VIN or registration number along with clear photos of your existing muffler and its labels. Our team can help you cross-check compatibility and pick a suitable replacement. For general guidance, see How to Find the Right Part and Compatibility & VIN Policy.

Used OEM mufflers & aftertreatment boxes from dismantled trucks

Where possible, we run and check donor vehicles before dismantling to confirm that there are no obvious exhaust leaks or abnormal noises. During removal, our technicians inspect each silencer for heavy corrosion, cracks, crushed sections and damaged brackets. Units that do not meet our standards are rejected; only usable OEM silencers and SCR/DPF boxes are cleaned, labelled and stored under cover in our warehouse.

Because we specialise in used OEM truck parts, you benefit from exhaust components that are designed specifically for heavy-duty engines and emissions systems, with the correct flow paths, mounting points and durability for commercial use. For more information about our processes, visit Our Dismantling & Quality Process and Warranty & Part Condition.

Related exhaust & emissions categories

If you are working on a wider exhaust or emissions repair, you may also want to browse:

• Exhaust & Emissions – overview of all exhaust and emissions parts;
• Exhaust Pipes – turbo downpipes, link pipes and flex sections;
• Exhaust Hangers – brackets and supports for mufflers and pipes;
• EGR Coolers – exhaust gas recirculation coolers and modules;
• Diesel Exhaust Fluid (DEF) Systems – AdBlue tanks, pumps and dosing modules for SCR.

Delivery, payment & returns

All mufflers, silencers and aftertreatment exhaust boxes are shipped quickly from our UK warehouse with tracked delivery options available across the UK and EU. For details about shipping methods, transit times and costs, please see our Delivery & Shipping page.

More information about payment options, VAT and our returns policy can be found on Payment & VAT and Returns & Refunds. If you need to combine a silencer with pipes, hangers and sensors for the same truck, our team will be happy to help you build a complete order.