Graves Motorsports Yamaha R1 2004-06 Full Titanium Exhaust System w/Titanium SilencersDescription: Graves Motorsports Titanum Full Exhaust System is same exhaust system used on our championship winning 2004 & 2006 AMA Yamaha R1 Superstock Bikes. This exhaust system features; Titanium headers & collectors as well as Titanium Silencers (w/conical endcaps). Gains of 14hp can be achieved with use of a Power Commander.Horsepower:Graves Full Exhaust System = 167.1 hp (+14.6 hp)Stock Exhaust System = 152.5 hpExhaust System Weights:Graves Full System = 15.2 lbs. (-2.2 lbs)Stock Full System = 17.4 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).When ordering these exhausts with a DynoJet Power Commander please specify in the order notes and we will pre map your PC3 USB for you!