I know another reputable tuner who is of the opinion that a 3 port is not necessary. What you do is choose your tuner, then roll with whatever they are comfortable with doing. If your chosen tuner is confident he can produce results without a 3 port, all good. If another feels it is required so that he is comfortable with how the car is handling boost, then so be it. Just have a chat with them and go with your gut instinct. Ask some questions (even if they're stupid - they're used to them, haha). Just don't choose based on price alone is all we're saying. Many of us have been around here and Subarus long enough to see results from various workshops/tuners and patterns that form over the long term.

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