From Broadway To Main Street USA - One Lap To Go
Figure 4 - Somewhat exaggerated, and while you may not observe quantitative values consistent with this graphical representation, the concept will remain valid in terms of how you can expect a "net" torque to be produced (summation of red and blue torque curves show by black curve). Essentially, results from a "two-size" or multiple peak header set will tend to broaden the engine's overall torque output, as you might want when off-the-corner and mid-straightaway acceleration is particularly critical. Photo by Jim McFarland
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