Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Is it illegal

Thread Tools
 
Search this Thread
 
Old Apr 23, 2003 | 05:33 PM
  #1  
underageZ's Avatar
Thread Starter
Teching In
 
Joined: Aug 2002
Posts: 42
Likes: 0
From: utah
Default Is it illegal

Is it true that it is illegal to change our stock exhaust manifolds to headers or is that a myth? Because i want to put the mac mid-length headers with cats and y pipe on my car but i dont want to be harassed more than i already am. If it is illegal how would i get around it every year for emissions?
Reply
Old Apr 23, 2003 | 05:38 PM
  #2  
FrankSS's Avatar
12 Second Club
20 Year Member
Photogenic
iTrader: (18)
 
Joined: Jun 2002
Posts: 1,084
Likes: 3
From: Clarksville, TN
Default Re: Is it illegal

you should be alright as long as you have cats and pass emissions.
Reply
Old Apr 23, 2003 | 06:01 PM
  #3  
someday's Avatar
TECH Resident
 
Joined: Apr 2003
Posts: 859
Likes: 0
From: here, ny
Default Re: Is it illegal

techncally it is illegal to 'move' ur cats from their stock location, which all mid and LT headers do... but, most inspection places don't realize that, or know where they're 'supposed' to be, so as long as they see the cats, ur ok, BUT, some places DO know where they supposed to be... so its hit or miss, unless u know someone, or ur state isn't that thorough...
Reply
Old Apr 23, 2003 | 07:01 PM
  #4  
Ackattack's Avatar
On The Tree
 
Joined: Apr 2002
Posts: 143
Likes: 0
From: Manhattan KS
Default Re: Is it illegal

Is this federal law, or does it very from state to state.

We don't have inspections in KS <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Reply
Old Apr 23, 2003 | 07:41 PM
  #5  
Retsik's Avatar
On The Tree
 
Joined: Nov 2001
Posts: 161
Likes: 0
From: Enola, PA
Default Re: Is it illegal

It's a federal law... <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" />
Reply
Old Apr 23, 2003 | 08:23 PM
  #6  
RPM WS6's Avatar
LS1Tech Administrator
20 Year Member
Shutterbug
Community Builder
Community Influencer
iTrader: (3)
 
Joined: Nov 2001
Posts: 34,664
Likes: 2,599
From: Schiller Park, ILL Member: #317
Default Re: Is it illegal

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Retsik:
<strong> It's a federal law... <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Dosen't matter. State does the inspections. If your state doesn't have inspections, cats are useless to you. And if you know how to get around a state that does have inspections, well, cats are equally useless <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Cali is another story though <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
Reply
Old Apr 23, 2003 | 10:20 PM
  #7  
FrankSS's Avatar
12 Second Club
20 Year Member
Photogenic
iTrader: (18)
 
Joined: Jun 2002
Posts: 1,084
Likes: 3
From: Clarksville, TN
Default Re: Is it illegal

ya i think it varies from state to state. but i have a local guy that does mine that only writes the vin on the sticker and writes down the license plate # and slaps it on. no inspection/drive/anything to see if you are "legal". <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> so.....no cats for me <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />
Reply
Old Apr 23, 2003 | 10:45 PM
  #8  
blown 346's Avatar
TECH Fanatic
iTrader: (25)
 
Joined: Jan 2003
Posts: 1,426
Likes: 0
From: Loves park/rockford
Default Re: Is it illegal

If you want to go by the book then it states that any modification or alteration to the stock exhaust system is illegal. Basically theu are saying that you can't even change mufflers unless it's with the stock one, No cop or ETS(Emissions Testing Services) are going to check it out that well. All they care about is if you're car passes or it doesn't. The headers might not be legal with an emissions sytem.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

10 Reasons Daily Driving a Swap Project SUCKS! (& 1 Reason to Do It Anyway)

 Michael S. Palmer
story-1

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-2

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-3

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-4

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-5

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-6

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-7

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-8

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-9

Top 10 Most Powerful Chevy Trucks Ever Made!

 
Old Apr 23, 2003 | 11:05 PM
  #9  
ramairs801's Avatar
Staging Lane
 
Joined: Mar 2003
Posts: 68
Likes: 0
From: Jackson NJ
Default Re: Is it illegal

then how much does the cats restrain your horsepower is it that much because I was thinking of ripping mine off and gutting then
Reply
Old Apr 23, 2003 | 11:27 PM
  #10  
imaplayer99's Avatar
Teching In
 
Joined: Feb 2003
Posts: 28
Likes: 0
From: plano, TX
Default Re: Is it illegal

IF U KEEP THE CATS, UR FINE
Reply
Old Apr 23, 2003 | 11:50 PM
  #11  
DONAIMIAN's Avatar
TECH Senior Member
iTrader: (18)
 
Joined: Jun 2002
Posts: 10,036
Likes: 0
From: NW Houston, TX
Default Re: Is it illegal

Loose the cats. It makes cool smoke behind your car when you go wide open <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
Reply
Old Apr 24, 2003 | 12:07 AM
  #12  
Y2k Pewter TA's Avatar
Teching In
 
Joined: Apr 2003
Posts: 13
Likes: 0
From: El Paso
Default Re: Is it illegal

Just gut out the cats w/o2 sims u will be fine our cars run clean already so u dont hv to worry <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Reply




All times are GMT -5. The time now is 09:07 AM.

story-0
10 Reasons Daily Driving a Swap Project SUCKS! (& 1 Reason to Do It Anyway)

Slideshow: 10 reasons daily-driving a swap project might not be for you. Or is it?

By Michael S. Palmer | 2026-06-17 09:39:05


VIEW MORE
story-1
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-2
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-06-18 10:26:23


VIEW MORE
story-3
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-4
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-5
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-6
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-7
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-8
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-9
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE