IMPALA 14 VIN 1 (4th digit, New Style), 2.5L, Federal emissions (opt NT7). IMPALA 15 VIN 1 (4th digit, New Style), 2.5L (VIN L, 8th digit, opt LKW), Federal emissions (opt NT7). IMPALA 16 VIN 1 (4th digit, New Style), 2.5L (VIN A, 8th digit, opt LCV), Federal emissions (opt NT7).
