Roadwarrior EPA21 One-Box

Aftermarket option for EPA21 applications
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Oct. 9, 2026
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The Roadwarrior EPA21 One-Box is an aftermarket replacement solution for applicable 2021 and newer Freightliner trucks equipped with Detroit Diesel engines. The integrated DOC and SCR assembly is available in two configurations: the C0390-DS, which includes the DOC and SCR, and the C0390-FL, which also includes the applicable DPF. Both configurations use Roadwarrior’s Metalcor catalyst technology and carry a 12-month warranty. The One-Box is designed to provide fleets and repair facilities with another replacement option for applicable Detroit Diesel aftertreatment systems. Availability is expected in October 2026.

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