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Why are Harley Davidson Motorcycles So Loud?

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Straight off the line today, Harley exhaust systems can emit noise as high as 80 decibels (dBs), give or take depending on the model. For reference, a typical car when idling emits noise at about 35-45 dB and in the high 50s to low 60s decibel levels at freeway speeds. Even something like a 2008 Ford F-450 truck only gets as loud as 51 dB when idling and 68 dB when traveling at 65 mph.

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Sources:

http://www.epa.nsw.gov.au/noise/vehiclenoise.htm
http://www.auto-decibel-db.com/
http://urbanmilwaukee.com/2014/09/02/murphys-law-the-unbearable-loudness-of-harley-hogs/
http://www-nrd.nhtsa.dot.gov/Pubs/810834.pdf
http://www.motorcyclecruiser.com/loud-pipes-cost-harley-davidson-tries-to-quiet-motorcycle-noise
http://www.noiseoff.org/motorcycles.php
https://en.wikipedia.org/wiki/Noise_regulation
http://windenergydevelopmentllc.com/Noise_Levels_Chart.html
http://www.kxly.com/news/spokane-news/Pipe-down-Spokane-passes-noise-ordinance/13419730
https://www.bikesbluesandbbq.org/pdf/hog_tales_noise_article.pdf
http://urbanmilwaukee.com/2014/09/02/murphys-law-the-unbearable-loudness-of-harley-hogs/
http://urbanmilwaukee.com/2014/09/02/murphys-law-the-unbearable-loudness-of-harley-hogs/
http://www.redding.com/news/harleys-roaring-pipes-test-noise-level-limits

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