Roush Cold Air Intake Kit Focus ST 2013-2016

Roush: 421609
MSRP: $299.99

Regular Price: $279.99

Special Price: $223.99

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Roush Cold Air Intake Kit Focus ST 2013-2016
Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Roush Cold Air Intake Kit Focus ST 2013-2016 Play Roush Cold Air Intake Kit Focus ST 2013-2016 Video 1 Play Roush Cold Air Intake Kit Focus ST 2013-2016 Video 2

Product Description

Roush Cold Air Intake Kit for all 2013, 2014, 2015 and 2016 Focus STs.

Add some horsepower to your Focus with the addition of a 421609 Roush cold air intake. Along with increased horsepower is enhanced sound from the blow-off valve. No drilling or cutting is required. This simple bolt-on intake maintains the factory PCV connection and utilizes factory PCM calibration.

Features 3" aircraft-grade aluminum induction tube with black texture finish for maximum air flow. A high flow air filter element is re-usable and washable. Premium silicone couplers have reinforced, weaved fibers for superior sealability. The 421609 system is topped off with a custom Roush stamped air box with air-tight hood foam seal.

- Premium high flow air filter with clamp
- One silicone coupler
- One aluminum induction tube
- Two mounting clamps
- Airbox tray with EPDM foam hood seal
- Instruction manual

*Not approved for use in California or states that require a California EO#.

Order a Roush Cold Air Intake Kit for your 2013, 2014, 2015 or 2016 Focus ST from CJ Pony Parts today!

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Installation Instructions

Mustang Installation

Focus Applications

This product will fit the following Ford Focus years:

Product Reviews

Write a review
Roush Cold Air Intake Kit Focus ST 2013-2016 is rated 4.9286 out of 5 by 14.
Rated 5 out of 5 by from Awesome Intake After bouncing around on many different intakes, I finally decided on this one. Most of the intakes I researched all used the same Green Filter (which is fantastic), so it came down to price and features. I'll admit, I chose the Roush because the open air box is aesthetically pleasing, and the price is superb! The parts are all very high quality, and installation was a breeze (with the proper tools). The suction and blowoff sounds are phenominal thanks to the filter. You also get a nice gurgling when you let off the throttle without engaging the turbo. Finally, you can definitely feel an excellent increase in throttle response. Overall, great product and I would recommend it to any ST friends.
Date published: 2015-01-29
Rated 5 out of 5 by from Looks great I have had this on for about a month. Gas mileage has not changed but the performance and sound has. The car seams to respond quicker. And it looks really cool.
Date published: 2015-02-09
Rated 5 out of 5 by from looks and sounds awsome Easy to install and looks the best under the hood ! No better name brand under a ford hood then roush.
Date published: 2015-03-24
Rated 5 out of 5 by from Awesome product! Bought earlier this month. Installation was decent had two hiccups. Difficult to get the coupling on the air inlet tube (nothing a little grease couldnt help with) and the attachment point closest to the airbox seemed to be distorted slightly (Didnt light up great and was slightly tilted). Nothing major though. It sounds good, looks good, feels good.
Date published: 2015-03-18
Rated 5 out of 5 by from 2015 ST Very easy to install CJ video is a lot better to follow than the dark images used in the manual. Turbo spool sound is awesome. No problems with 2015 installed under an hour with proper experience with cars. Not much in the hp gains only throttle response maybe 5
Date published: 2015-08-05
Rated 5 out of 5 by from Intake is great Very pleased with the roush intake, sounds awesome and works well. Also isn't too flashy, which I like
Date published: 2015-07-02
Rated 5 out of 5 by from Roush COI for Focus ST I've had this on now for a couple of weeks. Minimal performance gains, but I like that I can hear my turbo now. I'm using this as a starting point for future upgrades. Installation was pretty easy. It took me just over one hour and I could probably do it again in under 45 minutes.
Date published: 2015-06-16
Rated 5 out of 5 by from Great sound Bought it a few weeks ago. Shipped and delivered problem free. Install took some patience but not hard at all. This intake adds some great sound to the engine, you can actually hear the turbo whistle and blow off.
Date published: 2015-05-23
  • 2015-11-26T08:47CST
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Product Questions


Will this in any way void the factory warranty?

Asked by: Midlife ST
If there was any type of failure, the dealer would have to prove that this contributed to that failure to be able to void that specific portion of your warranty.
Answered by: CJPP Dave
Date published: 2015-11-24

If I install this product in my 2013 Focus St, will it need to be tuned to avoid a check engine light to appear?

Asked by: Daniel Hi
No, this intake does not require a tune. You will be fine.
Answered by: CJPP Dave
Date published: 2015-11-23

I'm going to be purchasing a 2016 focus st, will this intake and the Roush cat back exhaust fit the 2016 model?

Asked by: blooddragon222
The intake will NOT work but the exhaust will.
Answered by: rk cjpp
Date published: 2015-11-20

Hi will your product work in my 2015 ford focus sport?

Asked by: Jase77
No, it will NOT work on your 2015 Focus Sport.
Answered by: CJPP Dave
Date published: 2015-11-09

I understand that to wash the engine bay the filter would have to be covered up. but since it comes with the rubber seal is it safe to wash the car with the hood closed?

Asked by: RaceRedSt
Answered by: CJPP Dave
Date published: 2015-10-29

Is this suitable for Right Hand Drive 2015 Focus STs? I'm in Australia. Thanks

Asked by: funkjazzsouldisco
It's hard for us to say, we have not had the opportunity to test fit this part on a right-hand drive model. We cannot confirm fitment and have not heard anything from the manufacturer regarding RHD fitment.
Answered by: CJPP Dave
Date published: 2015-10-12

Does it come with the roush sticker?

Asked by: burd114
It should.
Answered by: CJ Pony Parts
Date published: 2015-09-09

Can I use this kit but still keep my green filter or do you have to use the filter that comes with the kit? Newbie here ;-)

Asked by: mich29
You'll need to use the filter that comes with the kit. The OEM filter isn't cross compatible.
Answered by: CJ Pony Parts
Date published: 2015-08-31
  • 2015-11-26T08:53CST
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Product Video

Roush Cold Air Intake Kit Focus ST 2013-2016 Video Transcript
By Bill Tumas: The Focus ST makes great power stock, but like any true hot ride, we're always looking for ways to make some horsepower. Whether your car is naturally aspirated, super charged or turbo charged like our Focus, a good cold air kit is one of the easiest ways to add horsepower. Today, we're going to install this Roush Performance cold air kit on our 2013 Focus ST.

The Roush kit comes with everything necessary to install on your Focus including this inlet tube which comes in black. We actually powder-coated ours white to match our car. Comes with the silicone couplers, hose clamps, seal, a new box and a reusable filter. For this installation, you need a quarter inch ratchet, 7 mm socket, 8mm socket, 12mm deep socket, extension, flat head screwdriver, flashlight and scissors.

Our Roush cold air kit is going to replace our air box lid with a high flow lid, we'll replace this tube here as well while still keeping the stock mass air meter. The first step is to remove our engine cover. Simply pull straight up and put it aside. The air box lid is held in place by these four bolts here, so we'll remove our stock paper filter, and we're going to remove the factory clamp for the rubber boot here and the other one on the side.

I'll separate it from the cam cover and remove. Now we can remove these two mounting bolts here from the cam cover to get the rest inlet tube off. This is your normal 8mm, but for this we're going to need a deep socket and you want to make sure you keep this, because this is actually one of the mounting points for your factory engine cover and you will reuse it.

I'm going to disconnect the PCV from the back of the tube. Simply squeeze them together and push backward. The last plan for removing the stock air tube is kind of hard to see but it's down behind the cam cover, it's the same size as the other one. Simply remove it and pull the whole tube off.

You want to remove the steel inserts from the factory air tube, you're going to use two of them in your new Roush. Simply push up on the metal insert, pull the insert out and then remove the washer. Now, we'll install the inserts we just removed on to our Roush inlet tube. Now, we'll install the coupler onto the tube here, and install the supplied clamp.

Now, we'll connect our cold air kit to the factory lower tube on the turbo, this will be the hardest part of the installation, since it's so far down the engine bay. You'll notice we actually put some towels on top of our engine to protect our powder kit, we do the same thing with the stock paint as well.

I'm going to tighten the clamp up by hand just to get it to hold before going there and tighten it down for good. We'll reach behind and connect our PCV to the inlet, pull our towels out, now connect to our meter, now tighten down the factory clamp. You want to install the Roush supply washer underneath this and then reinstall the factory bolt.

We'll reinstall the factory mounting stub for our cover. We'll reinstall the bolt to the throttle body, we'll then install our new filter. Now, we'll install the factory screws from our factory lid into our new Roush open lid and tighten everything down. Now, install the seal which snaps into place. Now, cut off the excess. Our last step is to reinstall our engine cover and our installation is finished.

A Roush cold air kit is definitely a lot less restrictive, so it should pick up some horsepower without any additional tuning necessary. Installation should only take you around an hour and you'll be back on the road in no time.