Header Dyno Testing & Comparison, Tri Y vs. 4 Into 1 - Performance By Design
Testing centered upon the two most common header configurations: the tri-Y and the 4-into-1. As the name suggests, the tri-Y features three distinct Y sections formed as the primary and secondary pipes merge together. The 4-into-1 simply joins the four (long) primary pipes together at a common collector. The difference between the two designs is evident here. View Related Article
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