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You're going to have to lean out a lot to run 20 psi on a stock ECU just to avoid hitting fuel cut. DSMLink is a nice option because it eliminates fuel cut from the ECU. You also get to log and adjust fuel, timing, and airflow individually, instead of hacking the airflow input to the ECU (with the AFC, you gain timing when you lean it out because you're placing the ECU at a lower load, which isn't always desirable).
There's also a ton of extra features with DSMLink, but you can read all about that on their website.
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