Headers, High Flow Cats and Emissions

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Apr 8, 2004 | 12:42 PM

RonC

Thread Starter

Racer

Joined: Sep 1999

Posts: 416

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From: Baltimore MD

Headers, High Flow Cats and Emissions

Has anyone installed headers with the high flow cats and passed Maryland or similar emissions testing? With the newer cars Maryland is using the OBD port to get there readings and I am not sure how sensitive this is to the change in the exhaust systems.

Apr 8, 2004 | 01:13 PM

bandit_99

Burning Brakes

Joined: May 2002

Posts: 818

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From: The Nether Region IL

Re: Headers, High Flow Cats and Emissions (RonC)

FLP Headers, hi-flow cats, Borla Stingers....

I passed the tail pipe sniffer...which normally wouldn't be used, but they could not get the computer to work when they hooked it up to my car, so they opted for the sniffer.

Apr 8, 2004 | 01:15 PM

bandit_99

Burning Brakes

Joined: May 2002

Posts: 818

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From: The Nether Region IL

Re: Headers, High Flow Cats and Emissions (RonC)

Oh, and from what I've been told, the OBD will only check for emission codes- if you do a search, you should find others' experience with this and some have passed even without cats and large cams.

:cheers:

Apr 8, 2004 | 01:24 PM

GTC

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Joined: Oct 2002

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From: Austin TX

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St. Jude Donor '03-'04-'05

Re: Headers, High Flow Cats and Emissions (RonC)

There are not any emissions tests in MS, but my Stainless Works LT headers & intermediate pipes with Random Tech high flow cats hasn't thrown any codes.

Apr 8, 2004 | 01:26 PM

Ragtop_Rob

Team Owner

Joined: Jan 2003

Posts: 21,234

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From: Freestate Corvette Club! Elkridge, MD

St. Jude Donor '17

Re: Headers, High Flow Cats and Emissions (RonC)

Quote:

I work with 2 LS1 people that have my same set up - 1 on a 2002 WS6 Trans Am MN6, the other on a 99 Coupe MN6

FLP long tubes, one with the off road pipes (no CATS), and other with the included high flow CATS, and regular other mods (Airfilter and such). BOTH passed OBDC emissions with no trouble here in Maryland. The girl with no CATS had the rear O2 sensors deleted via Predator (due to no CATS) - but the guy with high flow CATS did not have the rear O2 deleted - both passed.

The OBDCII test is FAR more reasonable - as long as your car runs well and is not throwing codes these should be no issues. OBDC can not measure actual output, instead it monitors engine running conditions.

Hope this helps!

Apr 8, 2004 | 01:48 PM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

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From: At the beach in little Rhody

Re: Headers, High Flow Cats and Emissions (Ragtop_Rob)

Just don't clear your codes. A friend did that in MD and they told him to come back in a month.

Apr 9, 2004 | 10:14 AM

LittleBoyBlu99

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Joined: Jan 2003

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From: Tyler TX

Re: Headers, High Flow Cats and Emissions (vettenuts)

Quote:

Just don't clear your codes. A friend did that in MD and they told him to come back in a month.

:eek: :D :lol: :thumbs:

Apr 9, 2004 | 10:24 AM

WhiteDiamond

Race Director

Joined: Jan 2001

Posts: 11,183

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From: Castle Rock CO

St. Jude Donor '15

Re: Headers, High Flow Cats and Emissions (RonC)

I passed with headers, high flow cats and a code check on my WS6. Unfortuenately, my high flow cats would cause the rear O2s to set a code every once and a great while and it had happened for my first visit and they failed me for it. The second visity, about 2 weeks later, it was fine. The heads/cam set up I ran in the WS6 also passed IM240 roller emissions tail-pipe sniffer when I lived down in Arizona.

Todd