First used a K&N air filter 15 years ago to increase engine performance. To be honest I can't say if it has improved or not but I quickly discovered the cost savings over buying paper filters every 5,000 miles. Definitely lets more air through and is just as easy to fit as a factory air filter and if you have some DIY skills you'll save money too. If you've made other engine modifications you'll almost certainly need an aftermarket filter to take advantage of them, and K&N has a long history and excellent reputation in this area.
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