…community concerns regarding excessive motorcycle exhaust sound, the Boston City Council fast-tracked enactment of Docket 0658 (An ordinance regulating the noise levels of motorcycles) on June 3, 2009. A public hearing was held May 26 before the Committee on Government Operations. The new ordinance mandates…

…-- peer pressure and self-regulation -- are what is needed to bring about tangible change. Fortunately, most riders, and a number of clubs, have seen the writing on the wall and are already talking to their members about quieting down their bikes. The key is to regulate ourselves before the government…

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State and city governments as well as AMA Motocross all have regulations limiting noise emissions, and now they are working hard to enforce them.Sound has always been an issue with off-road riding. Motorcycle manufacturers and aftermarket companies have tried to make their bikes quieter, but for years…

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…previous gen ZX-6R, ECU tuning on U.S. and Canadian models has strangled the top-end power by closing the exhaust powervalve at high revs to meet noise regulations. The European model makes a claimed 123.3 ponies, a healthy boost of almost 7, plus it allows the engine to pull stronger up top, making its peak…

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…it charges into the future. Mounting challenges - including larger more powerful engines and ever tightening federal and state, tailpipe and noise regulations - have made the Midwestern high-performance engine manufacturer rethink the way it does business.In an era where bigger is better, many V-Twin…

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…to the engine and exhaust system allow it to comply with strict Euro-III emissions and tightening noise regulations. To meet noise standards, the engineers focused on reducing internal mechanical noise instead of muzzling the exhaust system. The result wasn't a power loss, but an overall improvement…

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…size. The motor, which at 790cc is a tad bigger than any previous production Bonneville, sounds a bit suspect when first fired, emission and noise regulations have taken their toll on the modern motorcycle's bark and the Bonneville hasn't escape the neutering process. It sounds horribly similar to a…

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…shorty silencer by a larger triangular-cross-section muffler which proved necessary in order to meet ever toughening government sound and emission regulations. A butterfly valve resides inside the exhaust and helps negate the performance-sapping catalysts that facilitate Euro 3 and Tier 2 EPA emission standards…

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…Manufacturers are faced with the task of meeting stringent new federal emissions and noise regulations while still trying to out-perform the competition. Of course, many riders aren't concerned with such regulations. Often, the first thing they do when they buy a new bike is to yard their stock pipe…

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…X-Wedge train. In accordance with the emissions standards, noise regulations were also a hot button at the Expo. But unlike the well-defined parameters of the 2010 EPA restrictions, ambiguity surrounded the discussions pertaining to noise. At what decibel level is a bike's pipes determined to be too…

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