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I was wondering what kind of gains people are seeing with just an ECU upgrade and nothing else. I am thinking about getting an exhaust and downpipe but for now I am stock.
 

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PDXTuning tuned a Stage 2 STi's over the weekend. They both had intakes and exhaust upgrades. Baselines were around 250 WHP on the Matrix Engineering Mustang dyno. After tuning they put down 270 WHP.

I have no idea what this car would have put down without the intake and exhaust, you you have to guess lower.

I would bet that you would get around 30 WHP and 30 Torque with just EM.
 
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