STL/MO how to pass emissions/inspection with mods?

ChrisAW · 03-23-2012, 03:08 PM

How do people in STL/MO deal with the emissions testing if you have deleted cats or supercharged? I've never really had a clear answer other than to convert back to stock for the test. A little rough to do with a SC...

MO stopped testing cars as old as my RX-7 was so I put it out of my mind.

Thanks!

THE TECH · 04-18-2012, 03:14 PM

I'm interested in this. I may have to move to MO/KS in the near future.

Boostin FD · 04-20-2012, 10:24 AM

When the time comes, I'm just going to put the Stock X-pipe back on. I know of a shop that does "Fast Pass"... but you still can't have check engine light on... When the time comes, i may go to them and see if it'll pass with my delete-R... not sure.

THE TECH · 04-20-2012, 11:00 AM

Quote:

Originally Posted by Boostin FD

When the time comes, I'm just going to put the Stock X-pipe back on. I know of a shop that does "Fast Pass"... but you still can't have check engine light on... When the time comes, i may go to them and see if it'll pass with my delete-R... not sure.

I think and luckily for me if I have to move there, the county does not have smog checks. Are safety inspections just to make sure that the car is ok or do they scrutinize non-factory parts?

ChrisAW · 04-20-2012, 11:12 AM

Quote:

Originally Posted by THE TECH

I think and luckily for me if I have to move there, the county does not have smog checks. Are safety inspections just to make sure that the car is ok or do they scrutinize non-factory parts?

Basically if they see any semblance of a catalytic converter you are good to go.

THE TECH · 04-20-2012, 11:13 AM

Quote:

Originally Posted by ChrisAW

Basically if they see any semblance of a catalytic converter you are good to go.

Is that assuming that you are in a county that requires smog or is that indicative of anywhere?

ChrisAW · 04-20-2012, 11:17 AM

Quote:

Originally Posted by THE TECH

Is that assuming that you are in a county that requires smog or is that indicative of anywhere?

I think everywhere requires an inspection and they will check to make sure you have cats. They don't have to be working, but they have to be there.

Boostin FD · 04-20-2012, 12:22 PM

They don't do Smog anymore in the MO... it's just OBD2 check and the visual inspection... If you don't have Cats, you can go to some place and ask for Fast Pass... they might do it... THat's what this shop in St. Louis does. They charge you 75$ for everything but it's in and out.

THE TECH · 04-20-2012, 12:24 PM

Quote:

Originally Posted by Boostin FD

They don't do Smog anymore in the MO... it's just OBD2 check and the visual inspection... If you don't have Cats, you can go to some place and ask for Fast Pass... they might do it... THat's what this shop in St. Louis does. They charge you 75$ for everything but it's in and out.

I like that idea. When did smog stop? According to the DMV site, it is still active.

Boostin FD · 04-20-2012, 12:40 PM

For cars 1996 and after, it's only obd2 plug... they do some scanning, make sure there are no faults and all the Emission stuff is operational.

We use to have that Gateway Clean Air program that acted like a Dyno with plugs for exhaust... however after number of engines getting damaged by people forgetting to turn the fans on or something, they canceled the program.

Cars before 1996 only require safety, cars after do the emissions and safety... but it's only that obd2 plug check thing.

THE TECH · 04-20-2012, 01:13 PM

Quote:

Originally Posted by Boostin FD

For cars 1996 and after, it's only obd2 plug... they do some scanning, make sure there are no faults and all the Emission stuff is operational.

We use to have that Gateway Clean Air program that acted like a Dyno with plugs for exhaust... however after number of engines getting damaged by people forgetting to turn the fans on or something, they canceled the program.

Cars before 1996 only require safety, cars after do the emissions and safety... but it's only that obd2 plug check thing.

Excellent news!

Epacy2 · 04-21-2012, 02:35 PM

It's based on zip code. I've lived in the STL area for 11 years and never had to do an emissions test.

ryn815 · 02-04-2025, 02:20 PM

Quote:

Originally Posted by Boostin FD

When the time comes, I'm just going to put the Stock X-pipe back on. I know of a shop that does "Fast Pass"... but you still can't have check engine light on... When the time comes, i may go to them and see if it'll pass with my delete-R... not sure.

I am in kirkwood, where is this place?

Brandoch · 02-04-2025, 06:34 PM

Quote:

Originally Posted by ryn815

I am in kirkwood, where is this place?

13 years ago!

ryn815 · 02-04-2025, 09:55 PM

Seen that after the post! Lol

03-23-2012, 03:08 PM	#1
ChrisAW Rear Admiral 14 Rep 316 Posts Drives: 2011 BMW M3 Join Date: Jan 2011 Location: St. Louis iTrader: (1) Garage List 2011 BMW M3 [0.00]	STL/MO how to pass emissions/inspection with mods? How do people in STL/MO deal with the emissions testing if you have deleted cats or supercharged? I've never really had a clear answer other than to convert back to stock for the test. A little rough to do with a SC... MO stopped testing cars as old as my RX-7 was so I put it out of my mind. Thanks! __________________ --Chris --2011 e92 M3 Last edited by ChrisAW; 03-23-2012 at 03:15 PM..
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04-18-2012, 03:14 PM	#2
THE TECH BimmerPost Supporting Vendor 329 Rep 12,980 Posts Drives: BPMsport 2012 E92 M3 Join Date: Jun 2011 Location: Kansas iTrader: (45) Garage List 2013 Nissan GTR [0.00] 2019 Sierra Denali ... [0.00] 1999 Nissan Silvia [0.00] 1999 Nissan Skyline ... [0.00] 1998 Toyota Supra [0.00]	I'm interested in this. I may have to move to MO/KS in the near future.
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04-20-2012, 10:24 AM	#3
Boostin FD Bored all the time 399 Rep 2,180 Posts Drives: Batmobile Join Date: Jan 2010 Location: Kirkwood iTrader: (2)	When the time comes, I'm just going to put the Stock X-pipe back on. I know of a shop that does "Fast Pass"... but you still can't have check engine light on... When the time comes, i may go to them and see if it'll pass with my delete-R... not sure. __________________ Current: 2014 991 Turbo RS Past: 15 GT3, 17 R8 SC, Two 16 M4 GTS’s, Two 18 GT350R's, Two 13 RS5’s, 13 M3, 10 R8, 15 M4, 09 M3, 04 M3, 09 S5, 02 M3... It all started with an RX-7 (FD).
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04-20-2012, 12:22 PM	#8
Boostin FD Bored all the time 399 Rep 2,180 Posts Drives: Batmobile Join Date: Jan 2010 Location: Kirkwood iTrader: (2)	They don't do Smog anymore in the MO... it's just OBD2 check and the visual inspection... If you don't have Cats, you can go to some place and ask for Fast Pass... they might do it... THat's what this shop in St. Louis does. They charge you 75$ for everything but it's in and out. __________________ Current: 2014 991 Turbo RS Past: 15 GT3, 17 R8 SC, Two 16 M4 GTS’s, Two 18 GT350R's, Two 13 RS5’s, 13 M3, 10 R8, 15 M4, 09 M3, 04 M3, 09 S5, 02 M3... It all started with an RX-7 (FD).
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04-20-2012, 12:40 PM	#10
Boostin FD Bored all the time 399 Rep 2,180 Posts Drives: Batmobile Join Date: Jan 2010 Location: Kirkwood iTrader: (2)	For cars 1996 and after, it's only obd2 plug... they do some scanning, make sure there are no faults and all the Emission stuff is operational. We use to have that Gateway Clean Air program that acted like a Dyno with plugs for exhaust... however after number of engines getting damaged by people forgetting to turn the fans on or something, they canceled the program. Cars before 1996 only require safety, cars after do the emissions and safety... but it's only that obd2 plug check thing. __________________ Current: 2014 991 Turbo RS Past: 15 GT3, 17 R8 SC, Two 16 M4 GTS’s, Two 18 GT350R's, Two 13 RS5’s, 13 M3, 10 R8, 15 M4, 09 M3, 04 M3, 09 S5, 02 M3... It all started with an RX-7 (FD).
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04-21-2012, 02:35 PM	#12
Epacy2 Major 151 Rep 1,398 Posts Drives: F85 X5M Join Date: Jan 2009 Location: KC iTrader: (1) Garage List 2008 M3 [0.00] 2008 M3 [0.00]	It's based on zip code. I've lived in the STL area for 11 years and never had to do an emissions test.
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02-04-2025, 09:55 PM	#15
ryn815 Registered 0 Rep 2 Posts Drives: m3 Join Date: Feb 2025 Location: st.louis mo iTrader: (0)	Seen that after the post! Lol
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