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Can someone please explain what the velocity stacks do for our bikes? Why are they different lengths for non equal length exhaust and equal lengths for equal length exhaust? How did HD choose the length that they chose. The reason I ask is I am going with the airbox cover with the gages mounted in it and with that airbox cover the front velocity stack needs to be cut down. How will this affect performance. I am going with SuperTrapp exhaust until someone come out with the PERFECT exhaust (performance and style)

Thank You in Advance
Frank
 
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