Where abouts do you live? If you live near a circuit you can pop down during the day and they will test it for you, alternatively you can get a very good idea with an spl meter app on an iPhone + a friend sitting in the car holding the revs steady at about 4700/5400 rpm, measure about 1 metre from the exhaust and at 45 degrees above or to the side. Had results within 2db of calibrated proper kit
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Somewhere drinking Coffee
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