Emissions Testing with dual pipes - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 07-16-2015, 01:17 PM   #1
Registered Member
Iryan7's Avatar
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 223
Emissions Testing with dual pipes

Where I live, emissions testing is not mandatory. I am moving to Denver within a month. While living in Denver, I will have to pass emissions tests. I wanted to true dual pipe my mustang before moving, but will dual piping it cause it to fail emissions tests if I leave my catalytic converters on? Thanks in advance

Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Sponsored Links
Old 07-17-2015, 03:47 AM   #2
Registered Member
Join Date: Feb 2015
Posts: 23
My car is true dual and passes emissions. I live in NC where emissions tests are required as well. Leave the cats on and you should be fine.

Sent from my Z970 using Mustang Evolution mobile app
Horerczy is offline   Reply With Quote
Old 07-17-2015, 04:29 AM   #3

Strange Mud's Avatar
Join Date: Aug 2013
Location: Small Town
Region: Connecticut
Posts: 5,105
it shouldn't fail if it's running good and you have cats. This is assuming sniffer tests...in CT we went to tests involving hooking a scanner up to the OBD port and checking the various sensors with that.
2012 V6 traded for a 2017 VW GTI
Strange Mud is offline   Reply With Quote
Sponsored Links
Old 07-31-2015, 05:48 AM   #4
Registered Member
Join Date: Jul 2015
Location: Tahlequah
Region: Oklahoma
Posts: 22
In some jurisdictions that do emissions testing, there is a VISUAL component to the testing, so that even if your stuff passes the sniffer, if you run true dual on a car originally certified with a single system, they still won't pass it.

I don't know whether Denver is that anal or not.

California was a major pain in the arse in that regard. Hopefully, Denver isn't.
threepointeight is offline   Reply With Quote
Old 08-03-2015, 05:34 PM   #5
Registered Member
Mile high JDF's Avatar
Join Date: Jun 2011
Location: Thronton
Region: Colorado
Posts: 5,998
Denver is really lazy with their emissions tests. Every time I've emissioned my car I never once saw them look under the car to check for cats. There is a local guy that passed with long tubes and a factory midpipe that had quite obviously been modified to fit. I highly doubt the testers will know enough about these cars to fail you for having true duals. As long as you still have cats and pass their test then they don't really care.
Sold - Black 2000 Mustang GT, gone but definitely not forgotten
- Silver 2007 Corvette
Current - DHG 2001 Bullitt
Mile high JDF is offline   Reply With Quote

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Illinois Emissions testing with O/R X pipe Langer1099 2005-2010 Mustang GT 4 06-11-2013 07:45 AM
Emissions testing 1996v6stang 1996-2004 Mustang GT 10 01-12-2013 11:47 PM
Florida emissions testing Copenhagen54 1996-2004 Mustang GT 5 08-26-2012 06:00 AM
A little depressed... emissions testing sucks...advice? NeedSomeMods 1979-1995 Mustang GT 28 07-04-2012 08:37 AM
When is a car exempt from Emissions testing? dagoberto General Car Discussion 1 04-04-2010 09:53 PM

» Like Us On Facebook

09:36 AM

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.