GMPartsGiant.com offers the wholesale prices for genuine 2017 Cadillac CT6 parts. Parts like Exhaust System/Rear are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0L, 6 Cyl 3.0L, 6 Cyl 3.6L. Model Code: 4 DOOR SEDAN, BASE 4 DOOR SEDAN, PLATINUM 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN.