2003 BMW E39 M5

Buckhead Imports Supersprint headers installed on a 2003 E39 M5

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Buckhead Imports finished product of the Supersprint header install

The baseline in the dyno report (below) is after the custom software was installed. The second run is after the Supersprint headers were installed, which show some great gains 355 rwhp 324 ft. lbs. torque.