The BMW 540i xDrive's Exhaust Manifold optimizes engine breathing and locks noxious fumes away. Designed for a bolt-on installation to the cylinder heads, the Exhaust Manifold collects gases from each firing cylinder and combines them into a single flow to send downstream so the turbocharged six can keep pulling hard without power robbing back pressure. The early versions of the 540i xDrive received a rugged cast iron Exhaust Manifold, which is quick to heat up and resists warping. This makes it perfect for brisk winter starts as well as long journeys. The newer BMW 540i xDrive sedans feature a stainless steel tubular Exhaust Manifold that is lighter, has smoother runners, sharpens throttle response, and enables the faster spool of the turbo and expels excess heat from the bay. These popular versions offer the same reliability as the rest of BMW's fleet, fit perfectly in all 2017 through 2020 540i xDrive models optioned in ECO PRO for more economical cruising or in Sport for a drive through the mountains. A tight Exhaust Manifold seal maintains the correct air fuel ratio and protects the catalytic converters, ensuring great fuel economy and preventing carbon monoxide from entering the luxurious cabin. The component then aids dynamic stability control and any other safety system that needs the engine to provide consistent torque while optimally scavenging the exhaust. The owners of the BMW 5 Series have appreciated how the BMW designed the 540i xDrive engine to work perfectly with this Exhaust Manifold, and those who cruise the highway often comment that the BMW efficiency figures remain respectable once the 540i xDrive breathes through an uncracked Exhaust Manifold. The durability, performance gains, and model-wide compatibility make the Exhaust Manifold one unique part that enthusiasts look to fit so every drive feels factory fresh.
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