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Exhaust gas leaving the engine is turbulent. Flow straighteners, or honeycomb straightener, are installed to guide the gas before it reaches the catalyst. Without a straightener, uneven flow can reduce catalyst efficiency, create hot spots, and increase back pressure.
Straighteners are made from metallic or ceramic honeycomb structures. Thin walls form parallel channels. Cell size, wall thickness, and corrugation pattern affect flow uniformity and pressure drop. Metallic straighteners conduct heat, resist vibration, and tolerate thermal expansion. Ceramic straighteners are rigid but heat transfer is slower.
Even flow distribution ensures gas contacts the catalyst surface uniformly. This improves light-off performance and extends catalyst life. Localized overheating is reduced. Back pressure is more stable. High-flow or turbocharged systems benefit the most.
Placement, material, and geometry need to match engine flow, exhaust temperature, and operating conditions. Properly designed straighteners stabilize exhaust flow, protect the catalyst, and maintain emission performance over time.