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Sound alone will depend on several things:
If you have an aftermarket header
If you are running the stock Cat
If you are running a straight pipe
How long the resonator is
The quality of the resonator
The quality and build of the Catback itself
The design and constrution and matirials used for the muffler canninster
The larger diameter will certainly allow more sound to travel through it and at higher RPM the engine will be louder for sure.
The matched piping for an exhaust as opposed to mating the N1 to a stock setup will for one, not generate the optimum gains and two, the stock piping was never designed or tuned to run the best with it. The sound may be different but, I can't for the life of me think that other than a more high pitched sound that it could be louder than the full N1.
Look at how N1 style mufflers are designed, a straight through cannister that allows the maximum exhaust gas flow with minimal restrictions= Louder in general.
Yes a SS header will change the sound of your exhaust note. Mine growls more with just the header and HF cat but, my stock catback is of a different design. With just the header and cat it IS louder though.
I have never heard a smaller diameter exhaust give a louder sound, maybe a fart or burp but, not a louder low rumble or a louder shriek.
When you are developing your hypothesis are you comparing the EXACT same cars with identical mods or are they different models with different options? At idle I think that a full catback N1 would be louder than the stock piping and N1 Not the other way around.
As well, turbo applications do give a lower louder growl than NA setups that tend to shriek up high in the RPM band.
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