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Passing emissions with offroad pipe

Discussion in 'Exhaust' started by fuelforfire87, Dec 28, 2017.

  1. fuelforfire87

    fuelforfire87 Active Member Established Member

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    So my car is due for its first emissions test next year, and was wondering if it is possible to pass with an offroad pipe and o2 spacers. I know this one site where you can buy spacers with mini cats built in to the spacer to trick the rear o2's into thinking there are cats.

    http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html#Mini Cat O2 Simulator Big Daddies Garage

    otherwise I would have to get a catted midpipe and run regular o2 spacers or a third option would be to get Kooks green x or h pipe but that would be real expensive, lol. Whats your guys' experience with this issue? I live in illinois so I only have to pass the OBDII test, there is no visual inspection.

    Also another concern I have is that if I bring it to a test facility with the offroad pipe installed they would be able to tell just from the smell of the exhaust that there are no cats.
     
  2. Recon

    Recon Well-Known Member Established Member

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    No cats, not passing ever. Get a factory mid pipe if you have stock manifolds. It’s not a big hassle to just swap it over once it’s time for emissions testing.


    Pick your poison.
     
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  3. PC03GT

    PC03GT Well-Known Member Established Member

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    I've passed with long tube headers and no cats. The obd sees if your emissions equipment is working, not your actual emissions out of the exhaust
     
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  4. Gruca

    Gruca Active Member Established Member

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    This is not true at all. In Illinois, where I also live, I’ve passed without cats. All they do is check your ODB2 to make sure no codes are thrown and all of the tester items are showing ready. A good tuner can make it work for you without issue.
     
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  5. fuelforfire87

    fuelforfire87 Active Member Established Member

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    It is a big hassle if you have long tube headers like me, lol.

    Good to know. Did you go with someone local for your emissions tune? I know most of the big companies won't write a tune that forces your emissions system components to read "ready" because of the huge EPA fines and whatnot. I'm stuck with Lund so I will either have to find someone local to me to write a tune or try out those mini cat o2 sims with a Lund tune that leaves the rear o2s on.
     
  6. 96gt02

    96gt02 Well-Known Member Established Member

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    Yeah ive passed inspections with 2 different cars without cats, toughest part is the visual, first car was an 01 bullitt with o/r mac pro chamber, inspection people thought the pro chamber box was a cat i guess because they had all the mirrors and still passed me ( car did not throw a cat eff. code even without cats unless you really got on it. other car was an 03 mach 1 which my dyno tuner made me an emission tune that didn't throw any codes and sensors had normal readiness without cats, I did however run cat shells to pass the visal because i had an o/r x pipe with bassani mid lenths
     
  7. Gruca

    Gruca Active Member Established Member

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    On my 99 Z28, Speed Inc did the tune. Does Lund not set the rear O2s to ready? I’ve never seen a tune for an off road pipe where they weren’t set that way.
     
  8. fuelforfire87

    fuelforfire87 Active Member Established Member

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    Im pretty sure the rear o2s are turned off. I'll have to check with them when i put in a ticket for an emissions tune.

    Sent from my SAMSUNG-SM-G890A using Tapatalk
     
  9. Gruca

    Gruca Active Member Established Member

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    For my Mustang, I have no clue what mine are set to. I’m the first town south of Chicago that doesn’t require an emissions test :D
     
  10. 2012 Boss 302

    2012 Boss 302 Member Established Member

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    is it a visual test or an actual smog sniffer test???
     
  11. Redline8k

    Redline8k Member Established Member

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    I'm in the burbs of Chicago and am thinking the same thing. Looking to buy headers. I can't deside if I want to get the catted setup or deal with possible issues with the state. I'll have to talk to my tuner and see what he says
     
  12. Gruca

    Gruca Active Member Established Member

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    Neither. They plug in a scan tool to tour OBD2 and if it shows no codes and everything is ready, you pass.
     
  13. Gruca

    Gruca Active Member Established Member

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    As long as your tuner will tune the rear O2s to show ready, you’re good with no cats. Hell, my Bama tune on my v6 2011 passed emission with no cats.
     
  14. Redline8k

    Redline8k Member Established Member

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    Yes but without the cats won’t I throw a code for cat efficiently? Doesn’t that make you fail the test?
     
  15. Gruca

    Gruca Active Member Established Member

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    Yes, but it can be tuned to show ready and not throw a code.
     
  16. Redline8k

    Redline8k Member Established Member

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    Ok I'll have to talk to aed then
     
  17. fuelforfire87

    fuelforfire87 Active Member Established Member

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    No way in hell AED or any other reputable tuner is going to write a tune for an offroad midpipe that will pass emissions by forcing the emissions components to be "ready". They would face huge fines by the EPA if they were to get caught. I've seen Shaun from AED post specifically on here about this subject before.
     
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  18. Redline8k

    Redline8k Member Established Member

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    I knew it sounded to good to be true. I remember reading something Shawn posted as well
     
  19. Gruca

    Gruca Active Member Established Member

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    I just said it can be done...there’s a reason so many people have off road pipes and still pass emissions.
     
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  20. MG0h3

    MG0h3 Well-Known Member Established Member

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    When purchased my car was AED tuned with an OR mid. Pass every year in TX but we just have the scan/visual tests. No sniff.

    No CEL and no mil eliminators.


    Sent from my iPhone using svtperformance.com
     

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