GMPartsGiant.com offers the wholesale prices for genuine 2021 Chevrolet Trailblazer AWD parts. Parts like Heat Shields/Exhaust are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 3 Cyl 1.2L, 3 Cyl 1.3L. Model Code: 4 DOOR EXT.