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It depends on the car. Some cars will get more power, some will get less.
My old Hyundai got better FE with a cold air intake and a bunch of lightweight goodies hanging off the engine. My economy dropped when I put back in the stock airbox since it did not flow very well.
Now my current car gets better FE with warmer air entering the stock airbox. I haven't tested a cone filter WAI on the car yet. The frame opening the airbox feeds through is being blocked this winter to make a "poor man's WAI".
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2012 Chevrolet Cruze Eco 6MT
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