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Old 10-09-2004, 08:52 AM   #1
kevin2.5rs
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Member#: 67518
Join Date: Aug 2004
Chapter/Region: NESIC
Location: Bean town
Vehicle:
2013 Focus ST
TB

Default Exhaust = Cel

Is there any exhaust that will not throw a CEL?
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Old 10-09-2004, 09:33 AM   #2
Handsdown
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but i'mma maintain

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no axelback will, and catbacks shouldn't.
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Old 10-09-2004, 11:57 AM   #3
Crash477
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1989 BMW 325is

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Ive had the cobb catback for over 2000 miles and no cel.
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Old 10-09-2004, 12:05 PM   #4
gtwagon941
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High flow cats will, I'm pretty sure. O2 sensor throws the code. I think I may have heard of some header setups doing this also.

Jared
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Old 10-09-2004, 12:22 PM   #5
Nicklbrso
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Borlas are known to throw a CEL.
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Old 10-10-2004, 01:31 AM   #6
squeech
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2000 2.5RS w/ EJ205
tuned @ teh Ghetto Garage

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As has already been stated. Catback and axlebacks usually won't (anything IS possible) b/c a change in the cat is what throws off the O2 sensor and gives you a CEL.

<----CEL free with 2.5" catback for 2k miles, and Borlas for 6k miles
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Old 10-10-2004, 03:03 AM   #7
jamesfacts
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Stock.
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Old 10-10-2004, 08:24 AM   #8
bigdweeb
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Here's my experience with my 2000 RS. I had Borla headers, Random-Tech hiflo cat, Stromung midpipe and a Prodrive muffler. Aside from being loud it would throw a CEL (PO420). I tried the mechanical fix but it just kept coming back on. I just recently did my clutch and while I was down there I changed back to stock exhaust manifold from the Borlas. No CEL since! It actually turned off by itself after a couple days instead of me clearing it. I it hasn't been below 50 degrees yet, but hopefully it will stay off even in the cold.
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Old 10-11-2004, 04:46 AM   #9
RyansJDMgc8
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My borla's have never thrown me a CEL. Niether will Catback exaust. I high flow cat will throw a CEL almost every time. I have Borla headers, stock Cat, and 2 1/4" Catback APEXi N1 exaust and have never had a CEL for this reason.
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Old 10-11-2004, 11:19 AM   #10
DreddRS25
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BRP

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Didn't get a CEL until the borla headers went on.

I have borla->Stock Cat->2.25"MP+WRX axleback. Did the custom catback before the headers and had no CEL for about 2 months. 2 weeks after the borlas went on the CEL came on the a few weeks later went off, then just recently came back on. Each time was the P0420.

Well maybe having 81k may have something to do with it.
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Old 10-11-2004, 11:35 AM   #11
piker28
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had borlas on for awhile and no cel
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Old 10-11-2004, 11:39 AM   #12
BlkTS02
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Rev. Motorsports headers, stock cat, stromung midpipe, scoobysport axleback. CEL most of the time. It'll occasionally turn itself off but then it comes back in a day or so.

The mechanical fix didn't work for me either.
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Old 10-11-2004, 11:41 AM   #13
DreddRS25
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Quote:
Originally Posted by BlkTS02
Rev. Motorsports headers, stock cat, stromung midpipe, scoobysport axleback. CEL most of the time. It'll occasionally turn itself off but then it comes back in a day or so.

The mechanical fix didn't work for me either.
In some thread, it was mentioned that the CEL will turn off if for 5 consecutive drive cycles it doesn't find another error.

Just funny to me that my CEL will come on for weeks, turn itself off for a day or so and then come back on. Oh well as long as the code stays the same.
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Old 10-11-2004, 11:49 AM   #14
BlkTS02
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MBP

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I drive my car at least twice a day, so that would mean that it should turn off after three days or so.

Unless my definition of a drive cycle and SOA's are different.
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