Colorado Emissions and mods - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 17 (permalink) Old 03-25-2014, 11:12 AM Thread Starter
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Colorado Emissions and mods

I am wanting to do headers, but I'm not sure exactly what I need to do to meet emissions here in Colorado. I was thinking of something like the OBX system but it isn't catted so I am pretty sure it's not going to work. Does anyone have any suggestions?
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post #2 of 17 (permalink) Old 03-25-2014, 01:08 PM
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They will inspect to see if you have cats, even if you pass without them. So at a minimum it has to look like you have them. I have high flow cats groom Kooks and a cam. No clue if it will pass.
I will put the stock exhaust back on for the test if I fail with the current setup.


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GXP, 223/230 .634/.609 114+3, BTR .660 springs, BTR 7.425 rods, IWIS Pro Chain, Comp Rocker Trunions, VCM OTR CAI, Kooks 1 7/8 LTs, HF Cats, X pipe, Solo Axelbacks or Hooker Maxflows, Billet PCV catch can, CTS-V rear calipers. Updated GM trans mount, Camaro trans pan, HSRK w/ Omega 44005 Thermistor, BMR Rear Cradle bushings, BRM Trailing Arms, Pat G tune.

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post #3 of 17 (permalink) Old 03-26-2014, 09:01 AM
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I did my exhaust with long tunes high flow cats flow mastermufflers... did emissions Iin February after the swap on the stock tune passed no problem...
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post #4 of 17 (permalink) Old 03-26-2014, 09:22 AM Thread Starter
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What headers and cats did you go with?
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post #5 of 17 (permalink) Old 03-26-2014, 09:32 AM
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Does it matter what county you're in? I heard that since I'm in El Paso, I don't have emissions. If this is the truth, I'll sell you my Kooks Mids w/HFC's so I can get some DT's or Pypes.

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post #6 of 17 (permalink) Old 03-26-2014, 10:31 AM Thread Starter
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It's a statewide thing in Colorado I believe. I'm new here myself so I'm not totally sure about all of the rules.
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post #7 of 17 (permalink) Old 03-26-2014, 06:00 PM
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It's not statewide. Go to air care Colorado there is plenty of information. I think it's just Denver, but it might apply to some other areas as well.


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post #8 of 17 (permalink) Old 03-26-2014, 07:24 PM Thread Starter
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Ah ok. Well I am in Adams county and it appears that they definitely require it.
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post #9 of 17 (permalink) Old 03-26-2014, 08:44 PM
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My suggestion is wait until your initial registration is done and then as long as you drive by one of the road side testing stations 3 times within a year more than 3 months before your plates are due you don't need to go in for test where they would look. That is of course if it will pass the sniffer test which it should.

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post #10 of 17 (permalink) Old 03-28-2014, 10:02 PM
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I drove by enough road side van emission testers that my first registration renewal that requires emissions test was waived (automatically passed). I put headers on a week later and I'm not worrying about it until the next test is due (in 2 years I think).

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Kooks LT's 1 7/8", catted X pipe to GXP mufflers
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Long tube headers, Corsa catback
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post #11 of 17 (permalink) Old 03-28-2014, 10:17 PM
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Co has road side tests? That's GAF I know for sure I won't pass you can smell the failure standing 10 feet behind my car. Have
I got pa plates so I don't think they will pull me in. Or how ever they do it.
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post #12 of 17 (permalink) Old 03-28-2014, 10:20 PM
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If you have PA plates then you don't have to worry about CO emissions laws… but you do have to keep up with your PA registration and any emissions laws they have.

2009 G8 GT
Kooks LT's 1 7/8", catted X pipe to GXP mufflers
Rotofab intake, Avant Garde staggered summer wheels
Pat G tuned

2003 Corvette coupe
6spd Manual, lowered on C6 wheels
Long tube headers, Corsa catback
Heads/cam, Hurricane intake


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post #13 of 17 (permalink) Old 04-05-2014, 01:22 PM
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Quote:
Originally Posted by RockyMtG8GT View Post
If you have PA plates then you don't have to worry about CO emissions laws but you do have to keep up with your PA registration and any emissions laws they have.
That will not be possible since PA has inspection. I only know this because my car I just bought still has a brand new sticker in the windshield to go along with my PA temp tag.

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post #14 of 17 (permalink) Old 04-05-2014, 10:14 PM
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I got pacesetter long tubes... I was perfectly fine on emissions...
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post #15 of 17 (permalink) Old 04-07-2014, 09:35 AM Thread Starter
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What did you do for cats?
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post #16 of 17 (permalink) Old 04-25-2014, 02:49 PM
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I just went to do emissions today hoping to pass and nope I failed nox was at 2.5 limits 1.5 I have pacesetter long tubes and pace setter high flow cats would this mean the cats are shot and replace with same ones or what should I do I need a bit of help

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post #17 of 17 (permalink) Old 04-25-2014, 09:30 PM
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That could be and probably is but I would need to see the rest of the results. I would suggest getting a universal cat welded in on a pipe with flanges on each end. That way you can put an offroad pipe on whenever you aren't getting an emissions test!

send me a PM with that and I can get you an exhaust connection too.

2008 PBM G8 GT with Sport and Premium packages and Sunroof.

Mods: 6.0 iron block, dod delete, cam, Pacesetter LTs, VMAX ported TB, Volant CAI, 3200 stall, 3.45 gears
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