The Graves Motorsports YZF-R1 Velocity Stack Kit is specially designed to suit the new fuel injected Yamaha Motor. The kit of 4 injection molded plastic intake stacks mount directly into the stock airbox without modification and is designed to smooth out the power curve, increase horsepower throughout and improve fuel efficiency. Power gains of 4 HP in the mid range and 2 HP at the top end are to be expected. The item "GRAVES VELOCITY STACKS FOR 2004-2006 YAMAHA R1 & 2006-2012 YAMAHA FZ1" is in sale since Sunday, February 1, 2015. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Exhausts & Exhaust Systems\Other Exhaust Parts".The seller is "podiumsuperbikeinc" and is located in Novi, Michigan. This item can be shipped worldwide.