BMW M4 Rev Battle: Hamann vs Akrapovic!

This video features two BMW M4 F82 Coupe, both tuned by Hamann Motorsport. The grey one is equipped with an Akrapovic exhaust system (612HP) and BMW M4 Hamann Art Car is equipped with a full straight Hamann exhaust system (540HP). You can hear the exhaust sound of both cars by revving in a tunnel in Monaco!

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