S1R Black series Slip on exhaust. Over $600 new, this one is flawless for $400 or best reasonable offer. I am just more of a stock guy. I bought this bike with this one installed, and went back to the stock - my own preference. Has a great sound, but just not for me. It came off my 2018 Suzuki SV650, so that is the adapter pipe I have. Could be mounted on other bikes with the right adapter.