1127751 Manifold Fits Caterpillar ModelsOne New Aftermarket Replacement Exhaust Manifold for Caterpillar (Cat) Motor Grader, Wheel Scraper, and Engine This aftermarket exhaust manifold is a direct replacement for the Caterpillar (Cat) OEM part number 1127751. It is a single exhaust manifold used on machines equipped with the Cat 3408E engine, collecting exhaust gases from the engine cylinders and routing them to the turbocharger and exhaust system. Exhaust manifolds are subject to warping