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What it allows is the engine to increase the speed at which he air is taken into the engine, by reducing the network of pipes it has to go thru first. You will hear the engine taking in lungfulls of air, whereas you probably don't at the mo.
There's no reason it will use more fuel, but you will possibly be encouraged to drive harder/faster so you can listen to it more, but that's all. Basically, it improves air flow into the chambers, so making the engine more efficient.
You'll only get a nominal power increase, I'd say around 2-5bhp. That's all.
Hope this helps.
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