Arrow 71830AK Indy Race Aluminium Slip-On Muffler w/Carbon End Cap & Titanium Link Pipe for Yamaha YZF R1 15-16Product Descriptions Arrow's 71830AK Indy Race Exhaust, Aluminium with Carbon End Cap is made specifically for Yamaha YZF R1 (2015 2016). Indy Race silencers were designed to be used on certain applications, mainly those requiring an under seat silencer (making it difficult to use other Arrow's available sections), but once available Indy Race silencers were used also in some "standard" systems. Design has been inspired by the shape of certain US