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I’m a little confused at your comment, the article already mentions Mercedes doing it with a 4 cylinder, so it’s clearly possible, konnegsegg does it with a 3 cylinder that makes 600hp, so it’s clearly possible. I do suspect this article to be correct though, the sti will probably make 320-350 hp and see a substantial uplift in fuel economy from the current model, sky will be the limit for the aftermarket though