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It's easy to write off systems like Subaru's SI-Drive as gimmicks that are more about marketing than real-world utility, but the STI benefits from the SI-Drive system. Driving around in the Intelligent setting makes the car a little smoother and slightly more economical. Bumping up to S# setting gives the car much better throttle response that makes rev-matched downshifts extremely easy and is perfectly situated for track use or very spirited driving.