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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Nov-29-2009, 02:06:44 AM   #1
yaja23
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Default Euro Cats and CSL Headers possible to still pass SMOG in California?

Thinking of getting CSL Headers + Euro Cats. I've seen that user MikyMu still passed SMOG in Cali. Anyone else in Cali have this setup and still pass SMOG, legally?
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Old Sun, Nov-29-2009, 03:01:15 AM   #2
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Mikymu had brand new spanking cats and barely passed. A 200 cell cat with 30K or 40K miles worth of use will probably not clean up the exhaust as well. I'm thinking you will be required to seek an "alternate form" of certifying your car. The community response will be interesting.
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Old Sun, Nov-29-2009, 03:03:01 AM   #3
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Would driving the piss out of the car prior to inspection help?
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Old Sun, Nov-29-2009, 03:45:25 AM   #4
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It has been a while since I test smog my M3. I don't see why Euro 200 cell cats won't pass CA smog. You just need to heat up the cats well before testing. I know for a fact that 100 cells cats has difficulty pass CA smog even if it's hot. BMW has the new emission software recall and I heard you need to have that updated or you might have trouble passing smog even with stock headers and cats
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Old Sun, Nov-29-2009, 04:03:58 AM   #5
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As an elaboration on that which Mikymu has noted, in the State of California, when a manufacturer issues a recall notice that affects emissions, the "central computer" in Sacramento (or where ever it resides) recognizes this, and it looks for the latest software when the OBD II jack is connected to the M3. If the smog station's computer does not read this software in the M3's ECU, the car owner will automatically fail the inspection, and poof, there goes the equivalent of 10 venti Starbucks frappuccinos ($40 bucks)! Sorry for being a bit off topic, but it is somewhat related. Happy Holidays all!

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Old Sun, Nov-29-2009, 04:11:19 AM   #6
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Me thinks you will not pass.
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Old Sun, Nov-29-2009, 04:33:32 PM   #7
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Interesting. I'm highly considering getting the csl headers, euro cats + software. But if I have to jump hoops to pass smog, i may pass.
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Old Thu, Dec-17-2009, 06:22:20 PM   #8
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I have a client with a 2001 M3 Convertible with CSL headers and Euro cats. The car passed smog and the tail pipe but we had to flash the aftermarket software back to stock because the o2 sensor readiness codes were not set.
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Old Thu, Dec-17-2009, 06:35:49 PM   #9
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I have ebay headers + euro cats and I passed (barely). The cats weren't even that hot, my car sat around for 15-20 minutes before I was able to get it on the rollers to do the sniffer. I imagine if they were hot they would've passed by a better margin.
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Old Thu, Dec-17-2009, 07:25:41 PM   #10
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Super hot cats plus 87 octane would help (lower flash point.)
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Discussing Euro Cats and CSL Headers possible to still pass SMOG in California? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)