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I don't think IMHO, frequency has much to do with a matched set of mufflers. If the sound is not in sync between the 2 the (sound or frequency if you will, gets to the mufflers at different times) drone "seems" to disappear. A split second difference will change the sound even if it's very little.
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95 GT Vert
01 F350 SD
06 300C Hemi AWD
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