GMPartsGiant.com offers the wholesale prices for genuine 2020 Cadillac CT5 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. Model Code: LUXURY SEDAN EXT, SEDAN EXT, SPORT SEDAN EXT, V-SERIES SPORT SEDAN EXT.