Sound difference between the FMF 4-Stroke exhausts?

I am confused about the FMF 4-stroke exhausts. The Factory 4.1, Q4, and Powercore 4 all are supposed to be under 94db with the quite insert. So then what really is the sound/volume difference between these different exhausts?

I think that the difference is mostly in weight, the factory is really light, the q4 is a more trail oriented pipe, and the powercore didnt have weight on its mind.

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