ROADWARRIOR – Diesel Particulate Filters and Diesel Oxidation Catalyst Replacements is now an affiliate company of DCL International. ROADWARRIOR stocks a wide range of diesel particulate filters (DPFs) and diesel oxidation catalysts (DOCs) for model year 2007 and newer medium duty trucks, buses and heavy duty class 8 diesel trucks. All DPFs and DOCs are guaranteed to install as a direct fit part and work with your truck’s ECU.