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FocusSport used to sell the Cosworth 4-1 header and flexpipe, and now sell neither. After some research, I haven't been able to find the header available for purchase on any website. Was it discontinued or something. Does everybody know about this but me?
 

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It looks to be so, but they started making thier own. If it really came down to it, there are alot of good 4-1 header and flexpipes out there for a FF. Steeda, FocusSport, and possibly just check CFM.... cause they have alot of options and can be trusted with thier quality. [wrenchin]
 

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BodyKits=PantiesDrop
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cosworth discontinued most everything for the Duratec a few years back...you can still find some of the stuff sometimes, I found my header in Australia...

FocusSport has a clone of the Cosworth header for sale and its like half the price for i'm sure the same quality, just no "c-word" badge [hihi]
 

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the obx is also pretty much the same as a cossie. thats what i have. right now your options for a brand new header are obx, which is the cheapest. next is the f2, then the focussport. all are good. if you wanna save money, get the f2, the obx isnt bad but for the price difference i would go with f2. f2 was about 400 when i got my obx, which is why i got my obx.
 

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the obx is also pretty much the same as a cossie. thats what i have. right now your options for a brand new header are obx, which is the cheapest. next is the f2, then the focussport. all are good. if you wanna save money, get the f2, the obx isnt bad but for the price difference i would go with f2. f2 was about 400 when i got my obx, which is why i got my obx.
There is a difference between the F2 and the OBX/Focussport headers. One being the primary size. The F2 uses 1 3/4" primaries whereas the others use 1 7/8" primaries. This creates different breathing effects on the motor. The F2 will retain more of the cars around town driveability as the peak torque will arrive earlier. The OBX/Focussport is more helpful with the high end HP generation but will also help flatten the torque curve. So you may have less peak TQ with the same car/same mods with the OBX/Focussport but the torque generation will be much more linear.

I know with my ST I have the F2 header on it. Love it. Retains a lot of the low end power but I gotta say it really falls on its face in the higher RPM. If you look at my dyno sheet you will see both the HP and TQ peak and then drop off after around 5500 RPM. Now one thing you can do to counter this though is install a better breathing intake manifold like the one made by Cosworth. But honestly how many of us are going to buy a 700 dollar piece and then pay for custom tuning for it... lol. I am poor. Thats just me.
 

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Freeskiing Fanatic!
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so many header questions today! go with the f2 and the cossie intake mani.
 

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Does anyone else make an intake mani for the ST??
 
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