the motordyne utilizes Helmholtz "resonators" (excuse the term if that's incorrect) where as what this thread is focused on are the 1/4 side pipe resonators. Two very different approaches. THe Helmholtz works on volume, the side pipe works on length. From what I understand, the Helmholtz style covers a greater range, but they're harder for the DIY'er or local shop to build, because you have to have the different size pipes vs canisters for the effect.
If I'm mistaken, anyone, please correct me. THis is still all very new to me, as I just learned about this last night!
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