COBALT 06 2.2L (VIN F, 8th digit, opt L61), w/o AIR check valve; exhaust manifold is not drilled and tapped for AIR check valve. ION 04-05 2.2L (VIN F, 8th digit opt L61), exhaust manifold is not drilled and tapped for AIR check valve, w/o EGR port in head.
