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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 > Catless downpipes but keep orignal secondary cats



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      12-13-2012, 01:19 AM   #23
CalBear_335i
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Quote:
Originally Posted by nailer335 View Post
I've got catless DPs with stock midpipes and stock catback. On a true cold start in my garage (with the garage door open obviously ) I smell gas easily, because the secondaries haven't warmed up yet. Once they're warm, they reduce the gas smell significantly- you can't smell it from inside the car unless windows are all the way down and you're stopped at a light. Even then I rarely ever notice the smell and it is extremely faint.
This is true...

Faint smell with cold starts....no smell once warmed up
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      02-07-2013, 05:25 AM   #24
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Any updates? Has anyone attempted to pass with this set up in california.
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      02-07-2013, 09:22 AM   #25
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Quote:
Originally Posted by 335iJWC View Post
Any updates? Has anyone attempted to pass with this set up in california.
Its doubtful you would pass a sniffer test with catless downpipes especially in a place like California

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      02-07-2013, 11:22 AM   #26
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Originally Posted by RimasRS View Post
The main problem is that secondary cats will clog up. Because primary cats filtering and after they becoming worm/hot burning all kind of sh*t. If you will go just with secondary cats they will not last long...
You're not the first guy I've seen say this, but I don't recall seeing any threads about cooked secondaries. A lot of guys run this setup, is this really a verified risk?

And yeah, I should've done this before posting the question, but on the move today and just wanted to get the question out there.
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      02-07-2013, 11:24 AM   #27
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I have catless downpipes with the factory midpipes, but I want to remove my secondary cats. I have yet to find a shop willing to do it, though.
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      02-07-2013, 11:25 AM   #28
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Quote:
Originally Posted by 335iJWC View Post
Any updates? Has anyone attempted to pass with this set up in california.
I think California is getting rid of the sniffer test for 2013.
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      02-07-2013, 03:15 PM   #29
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Quote:
Originally Posted by mikead_99 View Post
You're not the first guy I've seen say this, but I don't recall seeing any threads about cooked secondaries. A lot of guys run this setup, is this really a verified risk?

And yeah, I should've done this before posting the question, but on the move today and just wanted to get the question out there.
I know this because I have other cars like 320d which had both cats primary and secondary I removed secondary because it was clogged (checked) this was suggested by workshop who is dealing with turbo chargers and they say that primary cat burn cleans by heat secondary catching everything else what's left from primary also they say that clogged cats can cause turbo damage.
Believe it or not but that is what I saw heard and I think it is logical
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      02-07-2013, 04:00 PM   #30
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Quote:
Originally Posted by RimasRS View Post
I know this because I have other cars like 320d which had both cats primary and secondary I removed secondary because it was clogged (checked) this was suggested by workshop who is dealing with turbo chargers and they say that primary cat burn cleans by heat secondary catching everything else what's left from primary also they say that clogged cats can cause turbo damage.
Believe it or not but that is what I saw heard and I think it is logical
No, I agree it's logical, just looking for instances on this platform....well, the gasoline burning variants. These cars have been around long enough now that somebody would have had to seen this if it is a high probability risk.
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      02-07-2013, 04:02 PM   #31
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Quote:
Originally Posted by Wesley Crusher View Post
I think California is getting rid of the sniffer test for 2013.
They are. My good buddy just passed his emissions exam so now he is certified. He said there is no way I would pass with catless with the sniffer test. And as far as the OBD2 only test for 2013, not all places are going to implement it at once... gotta find a place that does it.
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      02-08-2013, 04:15 AM   #32
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Quote:
Originally Posted by mikead_99 View Post
No, I agree it's logical, just looking for instances on this platform....well, the gasoline burning variants. These cars have been around long enough now that somebody would have had to seen this if it is a high probability risk.
Best thing catted after market downpipes and no secondary cats... Though I know this is expensive.
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      02-09-2013, 11:01 PM   #33
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Quote:
Originally Posted by eric@helix View Post
I have never seen the catless dp/catted tail section in the shop. I'm really curious as to the smell level compared to fully catless. Anyone done both? Comments?
I got this setup installed in your shop two weeks ago
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