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Any gains in the air filter will only happen at high air volumes (though it can help reduce sucking losses at lower volumes, whilst technically adding to pumping loses as well), and the gains will be so small you wouldn't 'feel' them.
It will however save you having to replace the filter at service, provided you inform BMW not to swap.
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Current: 135i Auto, Le Mans Blue - w/ Bridgestone RE-11 rears, GP Thunder 7500k angels, & "golf tee" mod plus a few M3 suspension bits and pieces...
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