That'd likely hurt your mileage. An after market exhaust just gets rid of a bottleneck that hurts HP... it doesn't do anything to make the engine work harder.
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buying a Intake would help, in theory it should. more air for the air/fuel ratio. aftermarket Turbos should also help. lose mpg spooling the Turbo but the forced air helps. but yeah shift in low rpms or take public transportation
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