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The function of the device is to reduce emissions by burning any unburned hydrocarbons (gas). When it goes bad, it will tend to pass less air through and effectively choke the engine, particularly if the insides break free. This can cause stalling or just significantly reduced performance. Likewise, having the wrong one installed can cause the wrong back pressure on the engine. While this wont damage your engine outright, it can lead to improper burning and possible carbon build up inside the engine and/or on the valves.

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