MoparPartsGiant.com offers the wholesale prices for genuine 2005 Dodge Magnum parts. Parts like A/C Unit are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 2.7L, 6 Cyl 3.5L, 8 Cyl 5.7L. Transmission: 4-Speed Automatic Transmission, 5-Speed Automatic Transmission.