GMPartsGiant.com offers the wholesale prices for genuine 2021 GMC Canyon 4WD Crew Cab Denali parts. Parts like Exhaust Pipe are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.8L Diesel, 6 Cyl 3.6L. Model Code: CREW CAB SLT - 6'2" BOX, SLT CREW CAB - 5'2" BOX.