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Overall volume control is going to come from your cat back system. Yes, the overall system is going to add but a majority of volume control comes from your cat back system.
The front pipe and over pipe will add slight volume but more resonance than anything so you want things in place to stop that, i.e. a cat and/or resonators. Catalytic converters will do a better job at sound suppression then a resonator but not by much and it does not do resonance control very well although its better then nothing. If, you want sound control and resonance control best to with a catted and resonated front pipe. If you don't care to much about volume but want to minimize the resonance/drone then a resonated front pipe is what you want. You really wont see any power loss or gain from this unless you have FI.
Headers on the other hand will do some volume and depending on the design/materials could introduce more resonance. They do more for tone and type of sound, EL vs. UEL. Although, even with the the same classification, i.e. EL or UEL, they will sound different between the brands and that comes down to design and materials. A catted header will reduce sound/resonance but seeing as most if not all headers use high flow cats it doesn't do much for resonance. The resonator on the front pipe will help out here too.
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