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While a larger exhaust will not directly cause your car to burn more gas, it will shift the power band higher, leading to less power at lower revs unless you drive with a heavier foot.
advantage is that larger, open exhaust will let you hear the engines tone and you'll know sooner when you are pressing to hard on the accelerator pedal.
There are online calculators that will tell you the correct size exhaust you need for a given RPM and engine displacement.
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