2021 Gm 6.6 Gas 181-hp, 2.8-liter I-4 (diesel) , 276-hp, 4.3-liter V-6 (regular gas) , 401-hp, 6.6-liter V-8 (regular gas) 181-hp, 2.8-liter I-4 (diesel) , 276-hp, 4.3-liter V-6