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I've been running S4 cams on stock springs and retainers for about 5 years now with no problems as they are designed to work on stock valvetrain. Throw the stoppers in the garbage.
As far as S3's vs. S4's, it's really up to your personal preference. I wanted the aggressive idle and top end power band that pulls all the way to the limiter.
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Originally Posted by crimsonrockett
Such a good signature.
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