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      09-19-2019, 09:02 AM   #1
beerdog1
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Illinois emmisions testing

I recently purchased a 2011 135. I am planning to make a few power mods. One will be installing a catless down pipe. Will I have any issues passing emissions testing?
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      09-19-2019, 09:24 AM   #2
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Originally Posted by beerdog1 View Post
I recently purchased a 2011 135. I am planning to make a few power mods. One will be installing a catless down pipe. Will I have any issues passing emissions testing?
You will fail emissions with a catless downpipe unless you install a 'downpipe fix' temporarily for the test. They're around $100 but allow you to pass without having to revert every two years.

On the other side of the river I avoid emissions by just driving less than 6,000 a year. (The 135i isn't my daily) I just get a mileage exemption.
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      09-19-2019, 10:03 AM   #3
beerdog1
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I had no clue ther eis a milage exemption. The 135i is my daily but I have another car that is a hassle.
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      09-19-2019, 10:16 AM   #4
beerdog1
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Anyone have details on this emissions fix?
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      09-19-2019, 10:16 AM   #5
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Originally Posted by beerdog1 View Post
I had no clue ther eis a milage exemption. The 135i is my daily but I have another car that is a hassle.
It's worth looking into. I also have cheaper insurance because of it.
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      09-26-2019, 12:20 PM   #6
beerdog1
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Regarding failing emissions testing with a catless down pipe. Is this because there will be a trouble code? Can't this be dealt with in a tune?
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      09-26-2019, 02:35 PM   #7
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Originally Posted by beerdog1 View Post
Regarding failing emissions testing with a catless down pipe. Is this because there will be a trouble code? Can't this be dealt with in a tune?
I'm not an ECU expert by any means, but as I understand it most tunes just suppress the check system so the cat is never in the 'Ready' state and that's why it fails. Maybe it's possible to specifically take care of that, but I don't think any of the off the shelf tunes do.
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      09-27-2019, 10:34 AM   #8
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This is something I posted a while back....


Bumping an old thread.. after numerous searches and different opinions on rather a catless DPs install will fail emissions... I decided to go for and go take the test without any DP fix. Before going I scanned the car for I/M monitors and the only one that wasn't ready was the catalyst. Now some people suggested that in Illinois it's an automatic fail if the catalyst are not ready. But that's only true if you're throwing some sort of code for it (P0420-P0439). Conditions of my car were as follows

N54-69000miles
Cobb Stage 2
VRSF downpipes
Stock mids and exhaust
Wagner FMIC
ETS Intakes
VRSF chargepipe
Stock turbos

After the test was performed at the emission station the results were exactly the same as when I scanned them... all monitors ready except catalyst. Got the "PASS" paper and I was on my way. Hope this helps some of you guys that are coming up for testing. Again not everyone's conditions will be same if you have multiple monitors not ready you will definitely fail. If they see a MIL On you'll fail. Make sure you complete a drive cycle if you have recently reset your codes, or performed a battery change. I didn't follow the cycle exactly but did the best I could for about 2 weeks 300 miles or so and that seemed to do the trick. To set all monitors after I had a misfire and cleared the code.

Update as of 03-31-19 I have since went back again to emissions and once again passed with same exact results. No issues
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