BMW S 1000 R Akrapovic vs stock exhaust sound HD

FB: https://www.facebook.com/VToldsChannel Comparison of stock and Akrapovic exhausts mounted on BMW S 1000 R 2014. Listen how they sound. The main difference is (apart from design) that the Akrapovic backfires when revving or slowing down with throttle closed. Sounds sick! Note that the Akrapovic is not a full system but just a slip-on exhaust. Maszyna BMW Auto Fus Warszawa - Ostrobramska 73, http://www.bmw-autofus.pl