I have to disagree.You will notice a difference with just the filter and topless.It is snappier off the line,and better throttle response.The stock filter is made from paper.The K&N is a oiled cotten filter.It flows more air than a paper element.The more air you can get into the engine the more power it will make.Yes it will run leaner.
And yes you will need some kind of fuel richment device.
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