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I could, but running a PP6 will allow me to have Pre run it on the dyno and tune it perfectly as opposed to the "hotdog into the air" method of mapping by butt dyno/engine load/feel.

 

You could certainly dyno tune with the stock ECU, it's just more work than one you can change on the fly. Although a romulator would solve that problem. That's probably how Subaru did it.

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