Camera's don't pick up how deep and loud Magnaflows and Borlas are, they sound 10 times better in person. I have this same setup on a 305, and I get compliments from guys with Flowmasters.
Great comparison!! I do think your camera microphones still leave a little to be desired tho. I'd try this exact comparison again, but play with settings to find the best quality sound, and also place camera another 5 or so feet from tailpipe, and not directly in front of the outlet, but more off to the side so as not to overload the microphone. Again, great video tho.