Basic Bolt ons: Exhaust Headers/Flex Pipes - Page 9 - Ford Focus Forum, Ford Focus ST Forum
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Old 04-11-2011, 09:08 PM   #81
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Can you explain? not sure i understand why.
The size of the cat is designed for the size/AFR of a given engine to heat up in the desired time. If its too big it won't heat up fast enough and you'll still throw the CEL for efficiency below threshold. You'll end up failing the readiness tests and thus OBD2 emissions inspections.
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Old 04-14-2011, 11:58 PM   #82
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Originally Posted by icase81 View Post
The size of the cat is designed for the size/AFR of a given engine to heat up in the desired time. If its too big it won't heat up fast enough and you'll still throw the CEL for efficiency below threshold. You'll end up failing the readiness tests and thus OBD2 emissions inspections.
Ony in the areas where they check that right? what if its just a visual inspection?

Then i guess i wouldnt even need a real cat right?

The guy in the post i posted pictures of ran a 3" exhaust, if you look his header is hooked to a cat why would he go threw all that work and expense if it didnt actualy pass? Im sure he has alot more mods
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Old 06-19-2011, 08:33 PM   #83
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So I was thinking OBX header/flex for the D20 with a resonator. Anything else better? Any tips from someone who has done it? thanks.
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Old 06-21-2011, 06:42 PM   #84
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The FSWerks header looks much nicer in my opinion, plus is a better design.
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Old 06-21-2011, 08:19 PM   #85
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So I was thinking OBX header/flex for the D20 with a resonator. Anything else better? Any tips from someone who has done it? thanks.
ive seen an obx with trubends on a d23, it sounded pretty sick!
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Old 10-01-2011, 09:56 PM   #86
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I've just added my Focuswerk's header/flex & stealth muffler to my Borla system awesome=no rice, just a loud deep deep tone, so I added a Magnaflow #12646 behind the Stealth= what a difference!!!!!! #12646=2.5'' center to center/ 6'' round like the stealth which is a Magnaflow, by the way! I love the Focuswerk's header=awesome work! Just goes to show you get what you pay for!
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Old 11-19-2011, 03:34 PM   #87
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ok so i was thinking of getting the OBX header with 2.5 inch straight pipe to a muffler tip. i was thinking about putting a resonator just for some back pressure and to calm down the niose a little bit.i dont think there will be too much restriction with this. i also have a tuner so i can tune to this adjustment. i also have a cold air intake to help with some power. what do you guys think? will it be a good setup?
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Old 11-19-2011, 04:16 PM   #88
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It will work, but it will be very, very loud. You may want to invest in a muffler or additional resonators.
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Old 11-19-2011, 04:30 PM   #89
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if i wanted to make it quieter should i get 2 resonators? do you think something like these would do it?

http://www.ebay.com/itm/STAINLESS-ST...e#ht_500wt_969
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Old 11-19-2011, 07:13 PM   #90
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I thought that it was generally viewed that the OBX was better header for the D2.0 as it has smaller primaries than the FSWERK header (FSWERKS have 1 7/8" primaries. I think the OBX has 1 5/16" primaries.).
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