STI is balls slow stock (I owned one as well) on the street as indicated by it's slow 5-60 mph time as the 0-60 numbers they get for those cars are only attainable via driveline shocking launches. From a red light stop you will be left behind the average V6 sedan unless you flog it. A tune makes that slow car fast so yeah it's a bit of a game changer. M2C is fast stock.
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