The stock silencer looks and works great, is very quiet and very light, so instead of replacing the whole silencer we can offer you a more cost-effective option. Our end cap was designed using the latest CAD design software. Designed to offer maximum performance; in our testing we found no power loss from the stock end cap. The EE screen-type spark arrestor makes maintenance very easy; by simply removing two bolts the screen can be removed for replacement or servicing. The easy access to the screen is great for riders who use their bikes for closed course and offroad - no need to have two silencers. Made in the U.S.A.