Quote:
Originally Posted by WARP TEN
Those who mention a "Drone" if you open up the closed section of the mufflers are correct. Our engines produce frequency spikes that produce noticeable and annoying resonance at two primary RPM points--1,800 and 3,400, with a less noticeable one around 2,400. The closed pipes of the earlier mufflers are closed for a reason: They are behind the Helmholtz resonators which mitigate the resonance at (I think) the 1,800 RPM point, while the center resonator handles the 3,400 point. (Or vice versa; can't quite recall). Each resonator is a closed chamber with one opening and is sized for a specific frequency. The Corsa system uses a similar feature they call quarter wave tuners, as do some others. So opening up the Helmholtz resonator would result in an unpleasant exhaust sound. Later stock mufflers have only one outlet but still retain the resonator section to combat resonance.--Bob
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Thanks for your helpful post, Bob - it is most appreciated!
