NissanPartsDeal.com offers the wholesale prices for genuine 2021 Nissan Altima parts. Parts like EGR System are shipped directly from authorized Nissan dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS. Grade/Trim: Platinum, S, SL, SR, SV.