3" is not going to open anything up for more power. In fact you'll see very little if any power gains on a cat back exhaust system.
Headers + tune will add power but also will increase the noise level quite a bit.
Corsa is a great one for keeping things tame (no drone at any level) and excellent for cruising without waking the dead.
Once you start modding further with headers and cam that's when things start to get loud.
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