Porsche Picture by slate blue | 5329877 |

Here's a comparison of the custom manifold and the CIS "S" runner. The custom one is slightly straighter and a bigger diameter, it's around 44 mm versus 40 mm. The factory S runners are ported and honed. As seen in the next pic.

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slate blue April 18, 2016

Here's a comparison of the custom manifold and the CIS "S" runner. The custom one is slightly straighter and a bigger diameter, it's around 44 mm versus 40 mm. The factory S runners are ported and honed. As seen in the next pic.

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