Lexus ES300 Exhaust Manifold channels the hot combustion gases of each cylinder into a single passage, which clears the way through the catalytic converter, muffler and tailpipe while keeping fumes away from passengers. Built to bolt tightly against the cylinder head and pipe using studs, nuts and gaskets, the Exhaust Manifold keeps the exhaust from backpressure and intake reversion to the tune of sucking power. Because the Exhaust Manifold is close to the combustion chambers, Lexus installs heat shields for some trims, which are designed to shield other parts in the car as well as the cabin floor. Early ES300 versions relied on thick cast-iron manifolds prized for durability, but more modern ES300 units may have welded steel or stainless tubular designs that behave like short headers and reduce flow restriction, freeing horsepower from the more heavyweight cast unit. Some assemblies combine the catalytic converter or include a threaded port for the oxygen sensor so that the computer can fine-tune the fuel mixture. When an Exhaust Manifold crack manifests itself, the familiar Lexus idle smoothness disappears and an ES300 driver may notice harsh noise. Timely Exhaust Manifold inspection helps to avoid costly emissions failures.
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