The twin 56mm turbos could probably make around 800-900hp... the most I've seen out of an S-trim is around 600hp. But... if you're only after 500-600, then I think the S-trim might be a better choice because the twin turbos might be somewhat lazy with a little 308. Ultimately, that all depends on the cam, heads, tune, converter, etc...
Now... a single 62-67mm turbo would be a different story on that 308. Just ask Blake Walker.
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" If you can't explain it simply, you don't understand it well enough. " - Albert Einstein
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