DINEX OneBox Diesel Particulate Filter for Detroit Diesel Engines 35.5" x 32.2" x 33" Stainless Steel OneBox EPA14 is a complete aftertreatment module engineered to address particulate accumulation and emissions compliance on Freightliner/Western Star trucks powered by Detroit Diesel engines. This OneBox integrates the particulate filtration elements and related housings in a single assembly sized and balanced for direct replacement of OE units. The core operational problem it solves is trapping and converting solid soot and particulate matter from diesel exhaust flows to maintain required emissions limits; DINEX particulate technology reduces solid particle emissions by more than 99% at the ceramic substrate level, supporting GHG/EPA14 regulations. The OneBox design restores and maintains exhaust backpressure within manufacturer targets by providing a properly matched flow path and filtration area, reducing the frequency of unscheduled engine derates and regeneration events caused by damaged or clogged aftermarket components. Included installation hardware such as clamps and gaskets streamlines field replacement, shortening labor time compared with custom-fabricated repairs and minimizing vehicle downtime. The assembly is built from corrosion-resistant stainless steel and ship-tested to weight and dimensional specifications for repeatable fitment, which simplifies inventory planning and part staging for maintenance shops. Using a complete OE-style OneBox reduces the operational risk of repeated service visits by addressing the entire aftertreatment function in one replacement step. The product is available as a new OneBox for EPA14-equipped systems and is presented as a direct-fit option to meet fleet uptime and emissions assurance requirements without incremental modifications to the exhaust system.