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Maybe the larger 987 exhaust is part of the puzzle as to why the exact same engine in a 2005 Boxster S makes more HP than the exact same engine in a 2004 Boxster S. And why the 2004 Anniversary Edition 986 S splits the difference in HP (since it has the 987 airbox but not other pieces including the exhaust?)
2004 986 S: 258 HP
2004 Anniversary edition: 266 HP
2005 987 S: 276 HP
Since it is the same engine, I think (and I heard of someone doing this I think) they just took the whole exhaust of a Cayman, including the manifolds, and put in on their 986 Boxster.
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