Akrapovic S-Y2SO11-AHCSS Slip-On Line Exhaust for Yamaha R3 2015-2017 The Akrapovic Slip-On exhaust system is designed for riders who do not want to make major modifications to their stock exhaust system. However, the Slip-On exhaust delivers great looks as well as increased performance for the bike. Akrapovic S-Y2SO11-AHCSS Slip-On Line Exhaust for Yamaha R3 2015-2017