For almost a decade, there had not been an affordable test protocol for certifying emissions-related, on-road diesel parts or systems in California. During a portion of that time, SEMA engaged in the development of a test method (as an alternative to the very costly engine dynamometer protocol required of the diesel OEMs) that would allow California Air Resources Board (CARB) Executive Orders (EOs) to be completed without imposing significant financial burdens on applicants.

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