2021 Chevy Impala Ss Ltz 401-hp, 6.6-liter V-8 (regular gas) 401-hp, 6.6-liter V-8 (regular gas) 401-hp, 6.6-liter V-8 (regular gas) 401-hp, 6.6-liter V-8 (regular gas) 401-hp, 6.6-liter V-8