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Message: <blockquote data-quote="vr2turbo" data-source="post: 1064587545" data-attributes="member: 92229">Found this.....What is the difference between a TRI-Y and a 4-into-1 design?A 4-into-1 design is perhaps the most traditional design. This design is common to the US market and is well used within the drag race fraternity. The basic principle behind the design is that the scavenging effect within the collector cone effects the three remaining pipes (in a V8 half), instead of limiting the pulse to the very next pipe in the sequence. This generally results in a header that performs very well in the mid-range to top end of the engines performance.A TRI-Y on the other hand splits the firing order evenly and uses the secondary pipes as sequential collectors. This results in generally a greater scavenging effect due to the fact that scavenging is achieved at 2 different points in the header design, firstly at the primary to the secondary collector and secondly to the secondary outlet collector. Generally this improves torque in the lower to mid range performance of the engine.Both designs are usually more efficient than a standard manifold and both offer distinctly different advantages.Daily street use need more low and mid torque rather then high end so Tri Y is more useful....<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /></blockquote>

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You guys like to diy things?
Look here:
http://www.aces.edu/~gparmer/efi/temp/wb/guide.html#circuit%20board

You can monitor the output using a cheap digital voltmeter.