Only a handful of stock Japanese exhausts can pass the two-meter-max test, but KTM manages to pass both the two-meter-max and the AMA 94 dB test. Or that the AMA plans to go to a 112 dB standard in 2014. What they didn’t know and couldn’t respond to was that the AMA was going to switch to the FIM’s 115 dB two-meter-max test (measured with the throttle wide open at six feet) for 2011. Starting in 2011, the Japanese manufacturers were focused on designing an exhaust system that passes the AMA 94 dB sound test (measured at 20 inches away at a very low rpm). The simplest and easiest way to make a pipe quieter is to reduce the core and outlet diameter, but technically, a designer should try to diffuse the pressure wave before choking the engine down. A perforated core, resonance chamber and mechanical chambers work to that end. Builders try to lower sound by disrupting and diffusing the pressure wave. The pressure waves are also responsible for the noise. While developing an exhaust system, a pipe builder can play with the overall length, tube diameters, various tapers, bends of the pipe, core size, end-cap diameter, holes, perforations and resonance chambers to achieve the performance he wants. A reciprocating engine is an air pump, constantly putting out high- and low-pressure frequency waves. As a rule, spark arrestors don’t have much effect on peak horsepower, but do lessen throttle response. Virtually every aftermarket exhaust pipe comes with a spark arrestor screen, installed or in the box, to allow the pipe to be used in designated areas where the law requires spark arrestors. Additionally, mufflers can be equipped with removable inserts, spark arrestors, replaceable end caps and different size stingers. Other design details are small cosmetic features, performance-specific resonance chambers, tapered cores, reducer rings and non-perf sections. A basic muffler consists of a canister, inlet cap, perforated core, packing and an end cap. There are 80 parts and almost 100 operations that go into making an exhaust system?the majority of these in the muffler’s construction. An aftermarket muffler has the potential for decreasing sound and increasing performance at the same time. A pipe is relatively simple to install, offers good power gains, and is visible on the bike (for showing off). An aftermarket exhaust system is the most popular way to increase power. It does not store any personal data.(1) Parts list. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly.
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