The Track Day Slip-On Line For The Yamaha YZF-R1 Was Specially Developed For Use On Racetracks Where Lower Noise Levels Are Required. It Is Made From Race-Proven Materials: Titanium For The Outer Sleeve And Carbon Fibre For The End Cap And The Muffler Bracket And Clamp.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.