Considerably more airflow as evident in the size of the filter above that of the original and the increase in mileage of almost 2 mpg. The fit was fine with one exception, the hole for the breather tube was 1/16 too small. Though the K&N filter is considerably larger it fits under the stock air filter cover fits fine. Having used K&N filters in my 6.0L Ford diesel, and two other previously owned vehicles, my confidence was proven well-placed in buying this one for my 2017 HD Ultra Limited. I have recommended it to friends who have bikes with the same Milwaukee 8 engine.
Paul Stockman
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Waldorf, Maryland