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0405ec Bmwm5 04 Z

Here are two of the runners that didn't have individual primaries but instead were collected in a near-log design. Notice the inside lip, which could only cause the out-flowing exhaust gases to become more turbulent.
Basic Bolt-On Power for the BMW E39 M5: Part 2

Here are two of the runners that didn't have individual primaries but instead were collected in a near-log design. Notice the inside lip, which could only cause the out-flowing exhaust gases to become more turbulent.  View Related Article

 

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