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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Jan-22-2019, 02:11:57 AM   #1
bmwstephen
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Default DEC Catalytic converters (CA)?

My stock cats have been long gone before it achieved 120K miles. It has since received aftermarket cats welded in place of the stock ones since ownership.

As I embark on its 4th smog, I can see those cats degrading as well so I am preparing to save up for a new set of cats down the road.

The OEMS are on backorder and expensive $1800+. However, I see supposedly direct bolt on ones from the mid pipe to catback from DEC which are CA approved.

anyone ever tried this set?
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Old Tue, Jan-22-2019, 03:14:31 AM   #2
bluptgm3
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Default DEC Catalytic converters (CA)?

BimmerWorld has had the DEC ‘cats’ on offer for a few years now, and as you have stated, 50 state legal.


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Last edited by bluptgm3; Thu, May-30-2019 at 05:18:37 PM.
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Old Tue, Jan-22-2019, 03:36:29 AM   #3
wgknestrick
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Default Re: DEC Catalytic converters (CA)?

Quote:
Originally Posted by bmwstephen View Post
My stock cats have been long gone before it achieved 120K miles. It has since received aftermarket cats welded in place of the stock ones since ownership.

As I embark on its 4th smog, I can see those cats degrading as well so I am preparing to save up for a new set of cats down the road.

The OEMS are on backorder and expensive $1800+. However, I see supposedly direct bolt on ones from the mid pipe to catback from DEC which are CA approved.

anyone ever tried this set?
Get a Vibrant GESI fitted and don't look back

https://vibrantperformance.com/catal...a25c4313ffdb25
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Old Tue, Jan-22-2019, 11:28:08 PM   #4
Nate047
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Default Re: DEC Catalytic converters (CA)?

Vibrant cats are not legal in CA unfortunately... I'm not an expert but the DEC offering looks like it should work. Dunno where to buy them though. You can also consider these: https://www.magnaflow.com/products?partNumber=448690
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Old Mon, Feb-04-2019, 11:14:37 PM   #5
j0rdan J
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Default Re: DEC Catalytic converters (CA)?

Get the cheapest CA legal cats you can. I promise you will need to change them every two years before smog. They just don't last as long as OEM BMW cats.
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Old Tue, May-28-2019, 04:00:22 AM   #6
I M Legend
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Default Re: DEC Catalytic converters (CA)?

Has anyone had good long term results with DEC or Magnaflow cats in CA?
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Old Wed, May-29-2019, 04:03:15 AM   #7
Earthwormjlm
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Default Re: DEC Catalytic converters (CA)?

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Originally Posted by I M Legend View Post
Has anyone had good long term results with DEC or Magnaflow cats in CA?
Don't know about DEC, but Magnaflows tend to last maybe for 2 smog test intervals depending on how much you drive.

There's a reason they are so cheap, very low platinum levels, thus not a lot of material. Cats are essentially consumables, so the less material inside, the shorter they last.
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Old Wed, May-29-2019, 07:28:10 PM   #8
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Default Re: DEC Catalytic converters (CA)?

I had the same problem as you with worn out original cats.

I found a local low mile E36 M3 that was being parted out and bought the mid pipe with the cats and O2 sensors attached.

I swapped it back to the worn out cats right after the test (which the new ones passed of course) and will reinstall every test cycle.
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Old Thu, Jun-06-2019, 07:26:41 AM   #9
Baby ///M3
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Default Re: DEC Catalytic converters (CA)?

My supercharged six-speed S52 passed the emissions here in CA with new Walker cats and O2 sensors. They’re readily available. Hope this helps.

Jon
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Discussing DEC Catalytic converters (CA)? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)