Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - FSWERKS race header for my D23 PZEV? (Questions/tune)
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Old 05-12-2012, 09:10 PM   #5
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Heres some options for you.

Originally Posted by Djzx3 View Post
I've read the basic bolt on's thread, but it didn't help much with my questions.
Basic Bolt ons: Exhaust Headers/Flex Pipes

I want to put the race header from FSWERKS onto my 2.3l, I know I need a new flex pipe and cat, along with a o2 sensor cheat for CT emissions.
IMO the Fwerk's header is the best.
My questions are, why do I need the o2 sensor cheat and why does the header only have one bung hole on it, When there are three o2 sensors for this PZEV model?
2 to monitor the before & after the convter.
Also, is this header going to fail visual inspections? If so is there a trick to it? Maybe a heat shield? You could take two stock 23 heat shield's & mod them to work= hide the header. Or do I need to wrap it anyways for heat? You could wrap it, but a official knowing what to look for, a header can't hide. The best flowing oem manifold/cat= a 23 ST manifold
If your inspector's know what to look for= yes it will fail then.
And what is involved in the tune? I have the OE Exedy fly/clt kit, with the Weapon R intake, and the exhaust done in 2.5 diameter trubenz piping from the cat under the car, back.
A tune will help out= turn off the rear o2 senser & egr, etc. A tune really helps out = makes your car more drivably, smoother.
Thanks, Hopefully Tom can stop by for the Tune questions, since I would probably buy it from him.

I run a Fwerk's header & tune w/ rear o2 senser & egr delete. The oem 23ST manifold/cat is the best flowing oem manifold. If you inspection= opening the hood, a header can't run & hide.
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