For 2012 model year 3.6L engine cooling system upgrades: Impeller diameter increased to 127mm (stock 118mm), flow rate boosted to 38GPM@3000rpm Shaft core high-frequency quenched with S45C medium carbon steel, hardened to HRC58-62 Pre-installed Victor Reinz gasket, withstands temperatures from -40°C to 230°C extremes Adapted OE no: 05183570AC with dust cover for Desert Edition models.