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SVT Shelby GT500
Exhaust Drone
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<blockquote data-quote="03dsgcobranc" data-source="post: 4831590" data-attributes="member: 49303"><p>sounds like some kind of resonance or exhaust signals bouncing off each other. I would try an x-pipe, it may smooth everything out. </p><p>found this on this page</p><p><a href="http://www.bimmerperformancestore.com/exhaustdrone.html" target="_blank">http://www.bimmerperformancestore.com/exhaustdrone.html</a></p><p></p><p>Drone in the exhaust is due to the engine driving the exhaust system at its resonant frequency. You can't get rid of it, any length of pipe has a natural frequency, but you can change the frequency (RPM) it happens at. Stock exhaust systems are tuned to put the resonant frequencies outside the normal RPM range the engine is run in. Sometimes they add resonators for this purpose. </p><p></p><p>To raise the resonant frequency of a system, shorten its length. To do this, you can try tail pipes that exit by the wheel (like GN's have), or you can try a muffler with a shorter internal flow path. If you have a true dual system, you can change the natural frequency of the system dramatically by adding a balance tube. If you can't shorten the system, then you can add slightly less than one wavelength of pipe. This will also raise the resonant frequency of the system.</p></blockquote><p></p>
[QUOTE="03dsgcobranc, post: 4831590, member: 49303"] sounds like some kind of resonance or exhaust signals bouncing off each other. I would try an x-pipe, it may smooth everything out. found this on this page [url]http://www.bimmerperformancestore.com/exhaustdrone.html[/url] Drone in the exhaust is due to the engine driving the exhaust system at its resonant frequency. You can't get rid of it, any length of pipe has a natural frequency, but you can change the frequency (RPM) it happens at. Stock exhaust systems are tuned to put the resonant frequencies outside the normal RPM range the engine is run in. Sometimes they add resonators for this purpose. To raise the resonant frequency of a system, shorten its length. To do this, you can try tail pipes that exit by the wheel (like GN's have), or you can try a muffler with a shorter internal flow path. If you have a true dual system, you can change the natural frequency of the system dramatically by adding a balance tube. If you can't shorten the system, then you can add slightly less than one wavelength of pipe. This will also raise the resonant frequency of the system. [/QUOTE]
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