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the most gains you will ever get is by swapping out your headers. MAYBE front pipe as well if you go catless front pipe, but either way you will not notice it. the tone of your exhaust might change if you get a front pipe without a resonator or cat, but if you remove the cat it will be slightly louder. if you get a resonator in the front pipe, it will probably also change the tone. changing out the stock overpipe will not give you any gains.
if you like your car the way it sounds now, just don't touch it and leave it.
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