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The 987and 986 use the same head and bolt pattern but the exhausts are designed differently to overcome the staggered position of the heads. On the 986 they chose the make the headers unequal and the connecting pipes to the rear silencer lengths the same. On the 987 they routed the exhaust differently and made the headers equal length and the rear muffler connecting pipes different lengths to compensate. Though I've not seen it tried I would guess a complete system could be fitted from a 987 onto a 986 but I would have to question the benefits ?
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