GMPartsGiant.com offers the wholesale prices for genuine 2020 Cadillac XT4 2WD parts. Parts like Air Intake System 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. Model Code: ALL PURPOSE 4 DOOR BASE, ALL PURPOSE 4 DOOR LUXURY, ALL PURPOSE 4 DOOR SPORT.