Rear Exhaust Manifold fits White 2-135 2-155 fits Oliver Tractors 2050 2150One New Aftermarket Replacement Rear Exhaust Manifold for White and Oliver Diesel Tractors This aftermarket replacement rear exhaust manifold is a cast iron component of the diesel exhaust system on White and Oliver large frame tractors. The rear manifold collects exhaust gases from the rear cylinder bank and channels them into the exhaust outlet, working in conjunction with the front exhaust manifold to route combustion gases away from the engine.