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If your committed to the learning curve for a Quarter horse, Binary Editor, and custom tune, I would recommend installing a wide band 02 sensor such as innovate. The visual gauge & data pulled into the BE software is very valuable for tuning. I keep one eye on mine at all times because it doesn't take long to grenade an engine if the air/fuel ratio is lean.
 

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That looks like their newest release. I went with the LC-1 and XD-16 gauge so if the new product does it all in one, great. The nice thing about this setup is it provides a narrow band input into your ECU so you can use the stock location for the O2 sensor instead of drilling another hole for this along with your stock sensor. Remember to follow the quarterly schedule of re-calibrating the sensor in free air or it will go nuts at some point and suggest you have a major vacuum leak. (Gauge starts to jump all over the spectrum between rich & lean) I would put this in ASAP and run with your stock computer to see if your set up leans out at some point in the power curve. You can also see how the computer reacts to various throttle conditions. In my case, with the stock computer, I could watch the Air/Fuel gauge lean out as I entered boost (slight detonation) and than the ECU would register the detonation through the knock sensor and dump fuel radically as a reaction which would immediately push my AFR to ~12. I realized then the tricks of running higher fuel pressure and using a FMU was not working for me and a custom tune was required.
 
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