One Gas Exhaust Manifold Fits John Deere 4000 4010 4020 4230 Replaces AR28061One New Aftermarket Replacement Gas Exhaust Manifold Fits John Deere 4000 Series Tractors This aftermarket replacement exhaust manifold Fits John Deere 4000, 4010, 4020, and 4230 tractors equipped with gas engines, including the 301, 341, and 362 cubic inch six cylinder gasoline engines. The exhaust manifold collects spent combustion gases from the cylinder head ports and routes them to the exhaust stack, and is a direct replacement for OEM part