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Small Off-Road Engine (SORE) ≤ kW Certification Program Spark-Ignition Marine Engine and Watercraft (SIME SIMW) Certification Program On-Road Light-Duty ≤ Lbs GVWR Certification Program PC LDT MDV HMC … Large Spark-Ignition Engine (LSIE) kW Certification Program Heavy-Duty Greenhouse Gas (HD-GHG) …