This is an OEM Indmar brand ETX STARBOARD SIDE aluminum Exhaust manifold used on the 5.7l and 6.2l engines. I had ALL the welch plugs replaced and painted with black Hi-temp paint not only for a better look but to help keep the welch plugs from rotting through... which is the common reason for failure. I also installed them on a customers WakeSetter with the Hammerhead motor to make sure there are no problems.