Walker® Commercial Vehicle - One call. One trusted Source.
Walker® offers one of the most complete selections of OE-quality replacement exhaust and emissions control products.
Walker® Commercial Vehicle- The industry’s best product support.
Walker products optimize efficiency and performance from your hardest-working vehicles.
Walker® Commercial Vehicle has all the products & accessories needed to complete the job.
WALKER® COMMERCIAL VEHICLE: e-Catalog

WALKER® COMMERCIAL VEHICLE: Dealer Locator
WALKER® COMMERCIAL VEHICLE: Part Image Search


WALKER® COMMERCIAL VEHICLE: Product Interchange

WALKER® COMMERCIAL VEHICLE: Muffler Dimension Search

WALKER® COMMERCIAL VEHICLE: Elbow Dimension Search

WALKER® COMMERCIAL VEHICLE: Clamp Dimension Search

WALKER® COMMERCIAL VEHICLE: Walker HD
WALKER® COMMERCIAL VEHICLE: Support
The Walker team is committed to helping technicians stay on the leading edge of emissions control diagnosis and repair for commercial vehicles. From web-based resources to live technical support, Walker is a trusted partner in the success of automotive service professionals.
WALKER® COMMERCIAL VEHICLE: EPA Standards

WALKER® COMMERCIAL VEHICLE: 2007 Highway Rule
Finalized in January 2001, and implemented with the 2007 model year, the controlling regulation’s objective is to reduce the harmful pollution from heavy-duty highway vehicles by more than 90%.

*Environment Canada emissions regulations are aligned with EPA standards.
WALKER® COMMERCIAL VEHICLE: 2010 EPA Standards
2010 EPA standards require that NOx exhaust emissions (which contribute to acid rain, smog and greenhouse gas levels) be further reduced to 0.2g / bhp-hr, an 83% reduction from 2007 levels.


WALKER® COMMERCIAL VEHICLE: Manufacturers’ Compliance Efforts

Commercial vehicle manufacturers continue to develop more effective emissions controls for diesel vehicles to meet the required reductions in emissions levels. Within the exhaust system, today’s diesel vehicles utilize "aftertreatment" (post-combustion) technologies to break down or capture harmful emissions.

WALKER® COMMERCIAL VEHICLE: Aftertreatment Technologies

WALKER® COMMERCIAL VEHICLE: DOC - Diesel Oxidation Catalyst
A DOC is a device designed to help reduce the amount of exhaust gas pollutants. Modern DOCs for 2007 and later applications have a unique catalyst formulation designed to oxidize harmful emissions (HC and CO) into less-harmful emissions (H2O and CO2).
WALKER® COMMERCIAL VEHICLE: DPF - Diesel Particulate Filter
A DPF, also referred to as a “soot trap,” is a device designed to collect harmful particulate emissions produced by diesel engines. Maintenance and service of a DPF is required on most commercial vehicles. In most DPF emissions systems, the filters are designed to be accessed for cleaning by separating the filter assembly from the exhaust system. It is essential to inspect and replace all worn or damaged exhaust components - in front of and behind the assembly - when cleaning the DPF.
WALKER® COMMERCIAL VEHICLE: SCR - Selective Catalytic Reduction
Selective Catalytic Reduction (SCR) is a process of removing nitrous oxides (NOx) through a chemical reaction, where diesel emissions are converted to nitrogen and water.
WALKER® COMMERCIAL VEHICLE: EGR - Exhaust Gas Recirculation
EGR systems direct exhaust gases into the engine intake, where nitrous oxides (NOx) emissions are reduced.