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The sales info suggests the 987 exhaust is lighter than that of the 986 and its redesigned to overcome the infamous heat shield rattle. In terms of performance, only the 3.2S 987 manifold is actually an upgrade over the standard 986 item , the design of the 2.7 and 3.4 manifold (header) offers no improvement. It is the same design and the part is common to both 2.7 and 3.4 engines on the 987. The 987 has two sets of catalysts however the 986 only requires one , so the first thing to do would be decat the manifolds and free up a bit more power. If you decat the 3.2 S manifolds you would get a good performance gain and a deeper exhaust note and still comply with emissions requirements for a 986. Its not as crazy an idea as it first sounds but only really viable if the complete system can be obtained at a giveaway cost , otherwise it would be better to fit an aftermarket exhaust.
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