High Performance Air Filter Intake Compatible With 2009-2018 Ford Focus ST RS Accessories, Air Intake Filter, Green Colour Engine Air Filter

Amazing replication of the RS intake to allow increased airflow while also sealing out the box from the rest of the engine bay, unlike many intake systems that claim to be "cold air" but really are "hot air" and actually hinder performance.Seeing a nice little boost to HP (minor) and all that pleasant whoosh sound coupled with a nice GREEN filter!Easy to install, fit like a glove, and a great value to mod the existing intake system without spending hundreds of dollars.

Looking for a cheap addition to your Focus that makes a slight power increase by allowing better airflow into the engine, while also making some cool VROOM noises. This was the ticket for what I was seeking. It looks nice with the partially open airbox that I have in my Ford Focus, and at the same time allows a better air flow over the stock air filter.Works well with the factory air box, and I would imagine as a standalone filter on a cold air intake. I currently have it in the factory air box with an RS open cover. It fit just as well if not better then most aftermarket/OEM air filters for the Focus. Haven't had any issues with performance or fitment since install, and would purchase another one in the future when this one is at the end of its life. My only insignificant issue with this filter is that I was not able to get it in a different color... Green isn't really my color, but it has kind of grown on me as I see it.Great product though!

Fits but not very well. Was able to make it work

Easy to install, fit great. High performance.

I can't believe what a difference it makes. First, I can hear the turbo more clearly, second, I can feel the throttle response more responsive, and third, I don't need to buy extra cleaning agent and oil. Because of his unique material, it only needs to be cleaned with water, which saves me a fee. Compared to the original paper filter, this filter is so great that it is worth recommending to Focus st owners

Me gusta bastante porque prefiero mantener mi motor stock, pero con la caja de filtro tipo RS y este filtro, puedo escuchar el alivio de la válvula interna al acelerar.Obviamente no llega al nivel de un intake como tal, con BOV a atmósfera. Pero si quieres un carro serio, que sea divertido de vez en cuando, es excelente.