The Hushpower PRO Series line of racing silencers will make you a believer. Developed with many of the top race engine builders and race teams around the country. The PRO series silencers feature a dramatic reduction of sound over open headers, without sacrificing your hard earned horsepower and torque. Race proven performance that will put you at the front of the pack. . quietly! The new Pro Series line of mufflers are designed to deliver performance that is equal too, or surpasses open headers while dramatically reducing exhaust sound levels across the rpm range with their patented wide-spectrum sound cancellation. The Pro Series race mufflers has been tested, and mandated by both USAC for the 2007 Western States Divisions of sprint cars, midgets, and by the C. R. A. for their sprint car series and has racing applications with other classes, racing on both dirt and asphalt. These round case mufflers are five-pounds lighter than competing "quiet" race mufflers and feature a 6. 00-inch X 16. 00-inch, 18-gauge aluminized-steel case with 409 stainless steel internals. The turned down outlet helps improve sound suppression and rugged aluminized-steel case that allows for easy mounting of welded-on brackets. These are the same as the standard Pro series mufflers except with a "turn-down" outlet integrated into the muffler for additional sound suppression in racing applications.Pit Stop USA offers Hushpower Pro Series Muffler w/ Turndown - 3.5" Inlet, 3.5" Outlet - 6" D x 16" L - Aluminized 13516101 at low everyday prices. Be sure to check out all of our products from Hushpower including Hushpower Pro Series Mufflers and Hushpower Sprint Car Mufflers.