FSWERKS 4-1 Race Header - Ford Focus 2.3L/2.0L Duratec

SKU: FS029
  • $479.95
  • 12 reviews

This item is due back in stock after

Our FSWERKS 4-1 Race Header is designed for track use and plays a very important role in maximizing exhaust flow for all out performance for your Duratec Focus. Construction consists of 16-gauge heavy-duty steel tubing and laser-cut flanges measuring a full 3/8" thick. We use 1 7/8" diameter large mandrel-bent runners which merge into our 2 1/2" ID collector for maximum flow. The FSWERKS Race Header will give lightly modified cars an 8-10 horsepower gain and an increase of 6-8 lbs. of torque measured AT THE WHEELS. Highly modified cars can see even better results. Supplied with wiring and connectors to extend the oxygen sensor harness, 2-bolt gasket, and mounting bolts. Finished in a polished ceramic coating that can withstand constant temperatures of 1200° Fahrenheit. Does not include a flex pipe, which may be needed on some vehicles. Race Only Application, not for street use.

Ford Focus Duratec 2.0L 2005 2006 2007
Ford Focus Duratec 2.0L 2008 2009 2010 2011
Ford Focus Duratec 2.3L 2003 2004
Ford Focus ST Duratec 2.3L 2005 2006 2007

IMPORTANT :  Supplied with outlet gasket, oxygen sensor extender FS029E and mounting hardware for assembly. No welding required.

NOTICE: This product is for RACE USE ONLY. Not for street use or public roads. Not for sale in California. A release waiver MUST be filled out with your order or it will not ship. Please complete the form here: http://www.fswerks.com/pages/releaseform

Customer Reviews
4.7 Based on 11 Reviews
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FSWERKS FSWERKS 4-1 Race Header -  Ford Focus 2.3L/2.0L Duratec ReviewFSWERKS FSWERKS 4-1 Race Header -  Ford Focus 2.3L/2.0L Duratec Review

High quality per usual

I have this header on my 2.5 swap and install was a breeze. It's really easy to reach the nuts with basic hand tools. Keen eyes will spot the spike in the collector and how the tubes fire in a circle. Attention to detail was paid there. The only thing I would ask for is a second o2 bung opposite side of the existing one to connect a wideband.

Reggie B.
United States United States
FSWERKS FSWERKS 4-1 Race Header -  Ford Focus 2.3L/2.0L Duratec ReviewFSWERKS FSWERKS 4-1 Race Header -  Ford Focus 2.3L/2.0L Duratec Review

Nice product

Install was pretty easy on my 2007 ZX3 S. Only issue was a slight fitment issue. The header rested on my steering rack. Was able to get it off the steering rack by flooding the dog bone and inching the motor forward a bit. It still rested on the rear line. I bent the steering line down to get it off the header.

Rowdy S.
United States United States


will these fit on my 2018 ford focus sedan?

United States United States

4-1 race header

I bought this header for my 2012 focus. The part isn’t listed to fit the mk3 focuses. The header bolted right up to the engine. It was a direct for all that I had to do was buy the flex pike that FSWERKS has for the mk2 focus. Overall I am very happy with the header. I have the mk3 fswerks racing catback with the header. The header made my car way louder and it sounds great.

Nick D.
United States United States

Looks good

Finish wasn't the greatest but performance is amazing. Added a little grumble when paired with factory exhaust

United States United States

Great Product, Awesome customer support.

I paired this with the stealth exhaust loving the sound of my focus now. Actually interacted with owner of FSWERKS over external affair involving them and he went above and beyond to make it perfect.

Derrick W.
United States

Wicked upgrade

I installed this header on a MK3 (with some adjustments needed), even though it's designed for a MK2, regardless it's a great upgrade, best mod to date it's changed the way the car performs...much more responsive and a large power gain from 3200rpm up to redline.....Fs werks should make some minor changes and offer this for MK3 applications!!

Dominique C.

best header made for the Dtec engine

So I own a 2014 mk3 ford focus 2.0 NA. I bought this header because the only company that made a direct fit header for the mk3 was obx and I prefer the quality of Fswerks products. I will say up front that this is NOT a direct fit part for the mk3 focus, however it does bolt up directly to the engine. it is about 1 inch short of the factory exhaust manifold so it will pull the exhaust forward about 1 inch. otherwise it fits perfectly. I currently have the stock exhaust and this header made a noticeable difference in power and acceleration. i can only imagine that with a full aftermarket exhaust it would get even more power. with the stock exhaust, the noise increase is minimal. this is a quality built product and a must do mod for anyone looking for more power. I have a custom ECU tune and would recommend that to anyone adding a header to get the most gains.


Fwerk's header is a quality piece.

Looking for a header for your D-tech, look no further. Here is a top quality piece, just add the flex & steath & a fwerk's tune w/ the rear o2 sensor & egr delete & your golden. Well worth the cost.


Great performance upgrade

I've had the Race Exhaust system from FSWERKS on my 2011 Focus and as soon as I purchased the 4-1 Header and installed it, you could notice a BIG difference in performance. The headers also made the car a lot louder which lead me to purchasing the "Stealth" muffler to my exhaust. Great product overall, 5 stars.

Diego B.


So glad I could get rid of the stock manifold setup. There's so much more response and power gains feel almost everywhere. I coupled this with the flex pipe and fswerks stealth exhaust and it really sounds sweet.

Art F.