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You need to see where your RPM's are going to be most often. If you're in need of the 3000-6000 grunt, go S3. If you're going to go with the 5000-8000 run most of the time, I'd go S4.
With that said, I'll be swapping in S4's into my car soon to see the difference. After many years I'm gonna give them a try to see.
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