7159 Green High Performance Air Filter

I bought it for my Grandsons car. It gave the car a different sound and noticeable power increase. Worth the money!!

Direct replacement for a Focus RS intake air filter.

The media could not be loaded. I bought this to replace my k&n as I wanted an open end filter. The intake & turbo noise is louder than the closed end filter I had previously.Do not over tighten clamp or it can force the filter off the box (I am using factory box with RS lid)

This is a great and visually attractive performance air filter.My one nit-pick is that instructions should say that hose clamp is not for RS application.Looking forward to tens of thousands of miles of clean air being sucked into my engine.

The Focus ST doesn't need much upgrading as far as the intake goes. The tubing flows just fine from the factory and fits better than nearly any other aftermarket intake tube. The only thing to really upgrade is a new drop in filter such as this Green filter. The Green filter is a direct swap for the stock paper filter and helps your car breathe a little easier when you start tuning.The stock filter is a paper media, closed end filter. The Green filter is a two layer cotton filter with an open cone end. The stock airbox has a hole where the end of the filter sits, so the Green filter opens up that entire area to pull in air aside from just flowing better in the first place. This also has the side effect of making your turbo whistle and BPV much louder in stock form, an enjoyable plus!The only other thing that could really help improve the intake is an aftermarket snorkel to add more fresh ram air from the front. Adding this filter opens the end up which means more warm engine air can get in, but others as well as myself have done testing and proved temperatures between the stock filter, the Green filter, and the Green filter with no airbox lid are mostly negligible. I feel like the snorkel would be about the only thing that would help lower that, but with a good intercooler it's not much concern.

Ran it with stock air box at first then a knock off RS air box. No issues or check engine lights. Fun noises with the RS style air box, but not enough to be annoying.

Just to be up front I’m NOT a ‘car guy’. With that being said I wanted to be able to hear my turbo spool up and blow off!! Cold air intake wasn’t in the budget.So after reading some reviews I gave this a try.It’s SUPER EASY TO INSTALL. Literally just take the old one out and put this in. Done!!Made a HUGE difference in sound! I can hear the turbo MUCH better!!I haven’t really noticed any difference in fuel eco or power. But it’s hard to really tell unless you can realistically measure it.Anyway for the price next time it’s due for an oiling I’ll probably just buy another one to replace it. Comes pre-oiled from the box. No issues with the air flow sensor btw.I definitely recommend!!

This is for the fit on a Ford Focus as it fits PERFECT to the airbox yet adding that cool air effect with a open end design. You have to see if it will do the same for your Ford design air box!!!I do know, If you have a 2015 Ford Focus & simular air box ( as that design went a long want on many fords) this is a must... if you like to hear the amazing sound of that engine ( mine is a 2.0 & it works on turbo) and not go broke on a cold air intake, this is a must!It does the same thing at a third of the price of a air charger! I love it! It is very well built, I was shocked at how it is better than any other top name I have used in the past! I will be ordering more of Green Fikters to replace the air chargers on my other rides! I didn't know they could be made this well.Skip the nightmare of a whole air charging instal!!! This saves loads of money and time! I love it! ( also delete the snorkel.. find how online)