Tech Analysis: BMW E39 M5
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With software and exhaust alone, the M5 saw a 12.2 lb-ft max torque gain at 6970 rpm. Pulleys and replacement air filters yielded an additional 13.1 lb-ft at 6100 rpm. In the end, the M5 realized a maximum gain of 20 lb-ft of torque at 6400 rpm at the rear wheels. View Related Article
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