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

SKU: FS029


  • $399.95
  • 6

Low Inventory

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 mandrel bent runners which merge into our 2 1/2" ID collector for maximum flow. The FSWERKS Race Header will give lightly modified cars a 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. Comes with oxygen sensor extender, 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.

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 and mounting hardware for assembly. NO welding required.

NOTICE: This product is for RACE USE ONLY. Not for street use/public roads. 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

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Derrick Welch
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.

Dominique Curtis

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!!


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.

Diego Bedoya

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.