Cadillac is celebrating the first 250 builds of both the CT4-V Blackwing and CT5-V Blackwing by branding these as Collector Series vehicles with two special plates on the sills and B-pillars. Each sill plate features the signature from a member of the Cadillac V-Series team, while the Collector Series plate found on the B-pillar corresponds to the serialized Performance Steering Wheel on each car.