For a total distance traveled of 1/2 wavelength, or 180 degrees. ![]() When the exhaust gases from your main chamber enter this J Pipe, they travel a distance of 1/4 wavelength into the pipe, and 1/4 wavelength back into the main chamber. So how does making the pipe a 1/4 wavelength cancel you exhaust drone? Therefore, a 1/4 wavelength = 90 degrees. Now, a wavelength can also be expressed in degrees whereas a full wavelength = 360 degrees. In this picture above, it is expressed as the distance between the two peaks. The wavelength of a sound wave is expressed as the distance of one full cycle of the wave. To understand the way this works to eliminate drone, we have to understand the concepts of wavelength, frequency, and phase shift. This pipe is calculated to be 1/4 wavelength of the frequency of your exhaust drone. The pipe is closed at the end after it branches out of your exhaust. Here is a supplemental write-up.Ī J Pipe is welded onto your exhaust, typically in the rear of the car near the muffler, and branches out in the shape of a J. No where online could I find a through explanation of the engineering behind why this modification works, so I decided to make a YouTube video explaining everything. ![]() My 2013 Civic SI Sedan's exhaust had a really bad drone in the range of 2000-2500 RPM, and upon some research I came across what is known as a quarter wave resonator, or commonly referred to as a J Pipe.
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