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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > How long have your secondary cats lasted w/ catless DP's



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      10-06-2015, 07:40 PM   #1
nitehawk
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Question How long have your secondary cats lasted w/ catless DP's

I would think that the stock secondary cats would start to deteriorate faster from running catless downpipes. I've only ran downpipes in the past with an aftermarket exhaust.

Curious to know from those running catless downpipes with stock piping, how long have your secondary cats lasted without issues? Anyone run into issues of clogging their secondary cats?

Last edited by nitehawk; 10-06-2015 at 09:46 PM.
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      10-06-2015, 09:40 PM   #2
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Good question.

The secondaries obviously won't throw any codes so they will just plug up over time, it would be good to have some input on this.
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      10-06-2015, 10:05 PM   #3
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Quote:
Originally Posted by Miller335 View Post
Good question.

The secondaries obviously won't throw any codes so they will just plug up over time, it would be good to have some input on this.
Yes exactly, and there's no way to inspect them other than cutting them out to take a look. By the time you'd find out, they'd be completely blocked causing drivability issues or stuck somewhere in the mufflers.
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      10-06-2015, 10:08 PM   #4
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Ive thought about this for a while as well, maybe some pics of removed secondaries after some mileage running catless dp would speak for themselves. I will be removing mine in a couple weeks and see how they and post a pic.
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      10-06-2015, 10:23 PM   #5
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Wasn't there someone who thought he had bad turbos/wastegates, because he couldn't boost, that ended up having clogged secondaries?
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      10-07-2015, 12:59 AM   #6
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Below is the post regarding failed secondaries.
I've also been thinking about this potential problem.
http://www.e90post.com/forums/showthread.php?t=1029980

Quote:
Originally Posted by deltalima0 View Post
I went a couple of months with a slow spool to 15 psi and a struggle to pull from 5k-7k rpm. Long story short I replaced all vacuum lines, boost solenoids, and removed the FMIC and charge pipes and reattached to ensure no leaks.

Problem remained poor slow boost only able to hit 13-15 psi, where before I could target 20 at 4500 rpm.

Next I started looking at turbos they also appeared fine we decided to just leave kittyless DP's unattached to the remaining muffler, my buddy said it could be that the secondary cats were clogged. We took it for a test drive, wala instant boost car back to beast mode louder than **** but problem found. Secondary cats were clogged to hell, so I bought a Cobb exhaust that removes secondary cats and car is back to running like a champ. A weight savings of easily 40-50lbs and way less restrictions.

Latest logs with a VD of the pictured pulls and how she is running with the new exhaust..
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      10-07-2015, 05:38 AM   #7
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Wow maybe this is my issue. I really feel like my car spools very slow. And I don't think its a boost leak.
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      10-07-2015, 05:42 AM   #8
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My cats lasted maybe 6 months before they went to shit after catless downpipes.
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      10-07-2015, 05:49 AM   #9
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Quote:
Originally Posted by NoPwrOvrMe View Post
My cats lasted maybe 6 months before they went to shit after catless downpipes.
Omg...6mths?!...i just put in CLDP's last wk..looks like i need to do the secondaries ASAP...
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      10-07-2015, 05:53 AM   #10
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It's also an early build 07. So it was eventually gonna go to shit soon anyways.
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      10-07-2015, 06:46 AM   #11
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So if you have rasp after putting in catless DPs and want to get rid of it, it's actually a good idea to replace the secondary cats with resonators?
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      10-07-2015, 09:06 AM   #12
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Quote:
Originally Posted by NoPwrOvrMe View Post
My cats lasted maybe 6 months before they went to shit after catless downpipes.
What symptoms were you having that led you to check them? Whats the mileage on your car and how many miles did you accumulate in those 6 months?
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      10-07-2015, 09:15 AM   #13
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I should mention that certain things will accelerate wear. Persistent misfires, oil leaking from the turbos and even having a tune that runs rich. Basically anything that causes oil, fuel to burnoff in the cats causing the catalyst material to melt over time.

Having no primary cats, you're left with the secondaries to handle all the cleanup. I think anyone running catless DPs should include this as a maintenance check. I'd like to understand what's a good interval to do this at.

Last edited by nitehawk; 10-07-2015 at 12:00 PM.
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      10-07-2015, 09:39 AM   #14
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Great idea, time to get mine checked, replaced, i've been running like this for six years.
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      10-07-2015, 09:45 AM   #15
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@deltalima0 how many miles did you have with catless DP's before they got clogged?
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      10-07-2015, 10:12 AM   #16
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I have no proof to back this up but I bet the guys running E85 most of the time will have their secondary cats last longer then the guys who mainly run pump gas.

The few times Ive ran pump gas my exhaust tips get black/sooty in no time but running e85 the tips never even get dirty really.

It would be nice if we can get some guys who had clogged secondaries to chime in on how many miles they went bad (while running dp's) at and what type of fuel they mainly used.
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      10-07-2015, 10:57 AM   #17
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I've been running with secondary cats only for about 5 years, 70k miles. Car pulls strong as far as I can tell.
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      10-07-2015, 11:23 AM   #18
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Quote:
Originally Posted by dicostal View Post
I've been running with secondary cats only for about 5 years, 70k miles. Car pulls strong as far as I can tell.
Good to hear yours (and others) have lasted so long. I had visions of more $$$ flying out my wallet when I first read this thread.
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      10-07-2015, 11:52 AM   #19
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I had 75k miles when I put the dp on. Ride about 15k miles before I notice some sluggish and the tone of my exhaust changing. Had a muffler shop check the cats since I had no resonator or mufflers. And it was fucked to hell and back.

Also been running 50/50 e85/91 since 2012.
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      10-07-2015, 11:52 AM   #20
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112k miles, FBO/tuned since 80k, no issues yet with the secondaries that I can tell.

That said, I have noticed my exhaust tone has changed. There is some rasp now on decel that definitely was not present before.
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      10-07-2015, 12:45 PM   #21
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Running E85 secondaries lasted fine for 40k, recently upgraded exhaust for sound, weight savings and a few horses... cats were a-ok, the exhaust only gave me about 10-15 hp up top on upgraded turbos. The secondaries had 110k on them when I replaced them.
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      10-07-2015, 03:27 PM   #22
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I just changed my secondaries today to magna flow 200 cell count.
Looked through the old ones and I could still see light through them, looked in decent condition I would say.
Performance wise I don,t feel any difference.
Car has 175,000KM on it and it been tuned since birth.

Yea kinda fell like I spent money today on this for nothing, but at least my mind is peaceful knowing there new, lol.
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