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Old 04-27-2008, 08:20 PM   #3
SkurdalenFox
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Join Date: Sep 2005
Location: Boulder, CO
Posts: 463
Yes, I'd like to try to cancel the 2000 RPM drone.

I am going to weld in flanges on the exhaust pipes so that I can put quarter tubes (perpendicular to the main tubes, obviously) between the axle housing and the gas tank. I plan to use slip-fit tubes so I can experiment with the length.

I expect a few problems: First, the exhaust temp. fluctuates, altering the speed of sound.

Second, the exhaust pipes are different lengths because I'm using unequal length headers. I am worried about this because it may be hard to tell which side is still droning. I may need unequal quarter tubes.

Also, It's probably a range of frequencies I'd like to cancel rather than one. I was thinking I could angle the "cap" on the end of the quarter tube to cover a wider range.

Also, since the frequency I'm trying to cancel is rather long, I don't know if I can fit long enough quarter pipes under the car to fully attenuate the drone.
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