Graves Motorsports Yamaha R1 2007-08 Cat Back Slip-On Exhaust System Stainless Steel w/Titanium SilencersDescription: The Graves Motorsports Stainless Cat Back Slip-On Exhaust System is handcrafted here at our headquarters in the USA. The Graves Motorsports Cat. back Slip-On exhaust system features mandrel bent stainless steel tubing and titanium silencers with tapered conical endcaps. Horsepower:Graves Cat Eliminator Slip-On Exhaust System = 166.0 hp (+9.4 hp)Stock Exhaust System = 156.6 hpExhaust System Weights:Graves Cat Eliminator Slip-On Exhaust System = 8.8 lbs. (-8.1 lbs.)Stock Exhaust System w/ Catalytic Converters = 16.9 lbs.NOTE: You may also select from standard “satin” finish or all new “BLING” polished end caps and entrance tips (available on the pull down menu).