Arrow 71829AK Indy Race Aluminium Slip-On Muffler w/Carbon End Cap for Yamaha YZF R1 15-24Arrow Indy Slip On Exhaust Yamaha R1 R1M R1S The Arrow Indy Exhaust was inspired by the fierce competition witnessed at the famous US circuit. It features a unique, diamond shape muffler that is unlike anything else on the market. This innovative diamond shape design allows the Arrow Indy exhaust to have reduced dimensions compared to traditional shaped exhausts. The exhaust also features a significant weight reduction without having to compromise