I am currently running Motordyne Shockwave exhaust on stock cats. I agree that it is the best sounding exhaust.
Tone is great and deep on cold starts. Once at temp, the car gives off a low rumble till about 4000/4500 rpms, and then (as the advert states) the shockwave sound is let loose. As far as comparison of dBs, I do not know which of the three listed is loudest, but will agree that single exit will be #1.
Sound will significantly increase once paired to test pipes (non-res will be the loudest).
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