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There was a small difference in the cars in California. You won't likely notice anything. It's not like the earlier days, at all.
B6 and H6 refer to boxer 6 and horizontally opposed 6. That's two ways of describing an engine cylinder layout. There's a technical difference between the two but it's irrelevant. All 911 engines had the same layout. Ignore crap like this.
JR
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