Without a doubt the stock exhaust of the BMW m4 is the quite a tame one, so there are on the market some alternatives with a much deeper grumble. The loudest and inmost sounding of the three is the Hamann exhaust, however some may such as the Akrapovic for its more civilized sound. The video customer does not take the 3 cars on the road and tape the noise, a more practical comparison.
An excellent exhaust system and its sound stands out through a series of downshifts, tunnel drives and backfires, for instance, so a more comprehensive test drive is in order before picking exactly what the very best exhaust system for the M4 is.
We haven’t had a chance to experience the Hamann system, however we did spend a couple of minutes with the Akrapovic device at Nurburgring in 2014. Sadly, in a parking area likewise.