Tech Analysis: BMW E39 M5
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With software and exhaust alone, the M5 saw a 16.1 max horsepower gain at 6970 rpm. Average gains between 6000 and 7000 rpm were between 9 to 10 hp. Pulleys and replacement air filters yielded an additional gain of 15.2 hp at 6100 rpm, raising the overall output to 364.5 whp.In the end, the M5 realized a maximum gain of 24.3 hp at 6400 rpm at the rear wheels. The sweet spot of the engine--5000 rpm to redline--saw an increase of 10 to 24 hp to the wheels over stock. View Related Article
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