9L5520 Manifold Fits Caterpillar 3306 D250E D250E II D300E D300E II SR4 330 330LOne New Aftermarket Replacement Exhaust Manifold Fits Caterpillar (Fits CAT) 3306 Engine This exhaust manifold is a center section replacement for the Fits Caterpillar (Fits CAT) 3306 engine exhaust system, designed to channel combustion gases from the engine into the exhaust system. Over time, exhaust manifolds can warp or crack, causing exhaust leaks and reduced engine performance. This aftermarket replacement is built to meet OEM specifications for