The reality is, everyone's hearing is not the same.
Many people can not hear low tone ranges.......
Others do not hear higher tone ranges.......
Since we all hear differently, your going to have different people thinking differently about the sound level that different pipe sizes offer, because the tone changes a lot with pipe diameter.The Cat back pipe diameter will make a difference in volume and tone. The larger pipe size on the cat back will allow more air to travel that is not muffled as much in a larger pipe with straight through design mufflers and minimal bends. The larger pipe on the Cat back will be louder and deeper.
The front parts (downpipes and testpipes) being larger will not change the volume, but the larger front will offer a deeper tone. For people that do not hear deep sounds well, they will believe the larger diameter Cat back is quieter or the same. For people that do hear deep tones well, the 3 inch Cat back will be louder. Adding small resonators reduces volume about 10% and large resonators in a H-pipe reduce the volume about 15%.
Adding 2 sets of resonators does add the additional sound reduction.
Adding Cats will reduce the sound about 20% Our 3 inch resonators for test pipes are very large, they do reduce sound more than the 2.5" test pipe resonators. I would say the 3" test pipe resonators reduce sound about 15%. If you are most concerned with sound level, and wanting the system to be quieter, going 3" with the front parts, and 2.5" with the cat back with the a transition cone on the rear of the test pipes is the best option.
If power is your ultimate goal, full 3 inch is what you want.
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