Recently updated on August 21, 2016 at 07:47 am
The BMW 1M Coupé shown in the video has got a sports exhaust system with flap function installed by HMS Performance that lets the tuned engine roar properly with its 323KW / 440PS and 680NM torque (achieved with the Stage 2 kit). Other changes to the 1 Series are the installation of a downpipe and sports catalysts.
(Video: HMS Performance)
From second 34 the doors of the sports exhaust system are open.