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BMW M madness on real roads! From the roaring M5 V10 with Eisenmann exhaust, to a 919HP single turbo M4, M4 CSL, classic E30 ...
The E39 M5 in the post mentioned being upgraded with an ESS supercharger kit which adds a lot more power to the engine. This kind of upgrade can boost the car’s horsepower by 150 or more.