Green Filter 7159 グリーン 高性能エアフィルター

Really good filter more air more turbo sound fits perfectly in stock place

Good whistle in 3rd, but no flutter. I do recommend it though.

I drive a 2013 Ford Focus ST and it's Everything I hoped for. Had a stock filter, switched to this high performance filter and it is great. Personally, I noticed a slight increase in throttle response, and high end power. If you're looking for a power adder, this isn't the ideal product, but it does help your car breathe ALOT better. The best part about this filter is the INDUCTION NOISE AND OH MAN is it sweet. Turbo sounds come through alot clearer and louder and you get more spool noise when boost kicks in. I run this without the factory intake lid, because this filter comes with a 'O' clamp to bite onto the intake piping. With the lid, there is still noise but to maximise noise I run it without. Expectations were met and I do reccomend this filter.

I have Focus ST 2017 its fit it and turbo sound is very nice , I recommend anyone have Focus ST to buy it

First I purchased the K&N air filter. The unit didn't even fit in the filter housing, so I had to return it - not sure what was going on there but I spent 30 extremely frustrating minutes trying to get the stupid thing to fit. Opening the box of the Green air filter, I immediately noticed a level of quality that far surpassed the K&N filter. The design is perfect, the rubber flange mates perfectly with the intake duct and installation was a breeze at under 2 minutes to install. Love that they include a clamp with the filter too! Engine feels smoother at higher RPM's, and looks and sounds great! Happy I sent the K&N filter back, and probably won't purchase K&N product ever again tbh. There's a big difference in the quality for sure! Go GREEN!