Improved bottom to mid-range power. Produce the low end of a longer header and the top end of a short header. Less susceptible to damage than a long header.Effectively reduces sound output by as much as 1.5 dB. Run well with sound-restricting mufflers. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Exhaust & Emission Systems\Manifolds & Headers". The seller is "vipracing450" and is located in this country: US. This item can be shipped to United States.