Peterbilt, 320,520 , Charge Air Cooler, Lifetime Warranty, (G-PB20M-Upper, X5929001, X5929001, EC171001, FW528001, F3161660101021, F3161666101021, F3161661202011, F3161661102011), This is a 2 piece charge air cooler, This is just Upper CAC, 2008-2017