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The stock Honda downpipe provides a wide torque band that is ideal for street driven cars. Thus, it is recommended that a primarily street driven car use the Spoon 4-2 header with the stock downpipe for better low and mid-range power. However, for track, to increase high rpm power, the Spoon 2-1 downpipe should be used to get best results.
2006-2011 Acura CSX
2006-2011 Honda Civic Si