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Is there any drone?

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wavelength = speed of sound / frequency.

Using 1100 feet/second as an approximate speed of sound, plug the numbers into the formula.

wavelength = 1100 / 125 = 8.8 feet.

The length of the tube should be one quarter wavelength or 2.2 feet = 26 inches.

The exhaust sound approaches the "T". Some of it turns and heads into the tube. It travels the length of the tube, reflects off the solid wall at the end, then returns back to the "T". Because the sound has travelled two quarter wavelengths in total inside the tube, it gets reversed in polarity just like if you swapped the positive and negative wires in a speaker. Once this shifted sound combines with the original sound at the "T", they cancel each other. :nod:

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okay, now we're getting the science! I appreciate that! Do you have any more pictures?

wavelength = speed of sound / frequency.

Using 1100 feet/second as an approximate speed of sound, plug the numbers into the formula.

wavelength = 1100 / 125 = 8.8 feet.

The length of the tube should be one quarter wavelength or 2.2 feet = 26 inches.

The exhaust sound approaches the "T". Some of it turns and heads into the tube. It travels the length of the tube, reflects off the solid wall at the end, then returns back to the "T". Because the sound has travelled two quarter wavelengths in total inside the tube, it gets reversed in polarity just like if you swapped the positive and negative wires in a speaker. Once this shifted sound combines with the original sound at the "T", they cancel each other. :nod:

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By plugging off each of the two tailpipes in sequence I noticed the bulk of the drone was caused by the passenger's side tailpipe. Therefore I only installed a single Helmholtz tube in the passenger's side tailpipe, in between the spare tire and axle. It only took half an hour to cut the hole and clamp up the tube as I had everything already fabbed from the MagnaDrones.

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