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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 > CA Emissions for DP back exhaust



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      01-11-2012, 03:58 AM   #1
ichibanumba1
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CA Emissions for DP back exhaust

Has anyone gone to get emissions with a DP back exhaust installed and passed (like AE, Vanguard, etc)

From what I've read, the only test that's a real concern is the visual test since emissions and functional tests pass with the 2 front cats on the stock DP.
Also, I'm reading that N55s don't even have secondary mid cats!?

Would a smog tech even know the difference between N54 & N55?
Couldn't I just say my cats are in my DP and BMW made it that way?
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      01-11-2012, 04:04 AM   #2
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You are correct assuming they don't look up your VIN and see the number of cats installed from the factory. You'll pass emissions and visual if they only count the stock DPs.
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      01-11-2012, 12:33 PM   #3
ichibanumba1
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That sounds promising...
anyone go through with it first hand?
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      01-11-2012, 02:54 PM   #4
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As long as you have the DP cats you are fine. Any cat back exhaust is legal for smog but the sound law is another thing.
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      01-11-2012, 03:57 PM   #5
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Well since CA doesn't require a new car to be smogged in the first 6 years of it's life, you might have a hard time finding somone who as done the test. I beleive preowned cars are 5 years, so that would be starting this year.
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      01-11-2012, 05:36 PM   #6
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CA is 6 years from manufacture date. So with an 08 you don't have to smog till 2014 unless you get popped by a cop to go see the ref. With an exhaust you run the risk because of the noise. The ref can look up how many cats your came with stock. But if you go see the ref, an aftermarket exhaust is not recommended.
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      01-12-2012, 12:42 AM   #7
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I figured it'd be difficult to find someone that's gone through it...

Looks like I might get away with it for smog purposes. A ref might be a different story, but I'm hoping I won't get hassled too much for a loud exhaust if I keep the stock DPs...

I just don't want to keep my stock piping in my apartment.
Maybe I can convince my GF that hanging my exhaust on the wall counts as art.
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      01-12-2012, 12:41 PM   #8
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Quote:
Originally Posted by ichibanumba1 View Post
I just don't want to keep my stock piping in my apartment.
Maybe I can convince my GF that hanging my exhaust on the wall counts as art.
^ lol
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      02-16-2012, 05:10 PM   #9
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Quote:
Originally Posted by Syndicategt View Post
Well since CA doesn't require a new car to be smogged in the first 6 years of it's life, you might have a hard time finding somone who as done the test. I beleive preowned cars are 5 years, so that would be starting this year.
true. I'm looking into selling my car, so I'll need to smog it. I'll let you know the results.
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      02-16-2012, 05:13 PM   #10
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Just go back to stock and change back after.
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