Fits my 2013 Civic Si as advertised. I am not a reducer at all and certainly not a modder. Installation took about 15 minutes of which I watched 10 minute installation videos on YouTube. Be careful with the mass air flow sensor; they are gentle. Installation was very easy to do with a few simple tools. The post-install improvements were VERY subtle (as expected). I noticed a slight increase in throttle response and noise under load. I've heard big tales of a 10mpg increase and wild horsepower gains in other reviews here. Make no mistake. This is just an upgraded, high quality and reusable standard filter. That's all!
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