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How loud is a BMW M4 convertible?

This video features a BMW M4 F83 Convertible which has been fitted with an Akrapovic exhaust system. We saw this M4 during ...
BerlinTomek on MSN

BMW M4 with exhaust & burnout performance

This video features a modified BMW M4 by Hamann, equipped with an Akrapovic exhaust system and tuned to Stage 4 performance.