IMPALA 18-19 3.6L, California emissions, opt NUG. IMPALA 20 (3.6L), California emissions, opt NUG. XTS 18-19 (3.6L), VIN 3 (8th digit, opt LFX), California emissions, opt NUG. IMPALA 15-16 VIN 1 (4th digit, New Style), 3.6L, VIN 3 (8th digit, opt LFX), California emissions, opt NU6.
