Headers non-catted
Thread Starter
Racer
Joined: Oct 2008
Posts: 415
Likes: 5
From: Owensboro Ky
St. Jude Donor '11
Headers non-catted
I've been looking up headers and how bad the smell can be without cats. I was wondering if there was anybody around Owensboro KY that would let me check out their car before buying something I might not like. Is the smell really that bad? Or is it just when you're stopped?
By the way I have an 08, c6, ls3
Thanks!!
Matt Lowry
By the way I have an 08, c6, ls3
Thanks!!
Matt Lowry
Melting Slicks
Joined: Oct 2010
Posts: 2,314
Likes: 4
From: Cape May, NJ; Guntersville, AL; Orange Beach, AL
I just got LG superpro's. After research get the hi-flow cats. No performance difference (well maybe 1 or 2 HP) and you are still legal and don't have to deal with the smell. I was thinking about going catless but the smart people on this forum talked me out of it after I stated what I wanted out of my car. I do see why someone would run catless but its not for me. Good Luck.
Instructor
Joined: Jun 2010
Posts: 160
Likes: 0
From: Spring Lake Michigan
I've been looking up headers and how bad the smell can be without cats. I was wondering if there was anybody around Owensboro KY that would let me check out their car before buying something I might not like. Is the smell really that bad? Or is it just when you're stopped?
By the way I have an 08, c6, ls3
Thanks!!
Matt Lowry
By the way I have an 08, c6, ls3
Thanks!!
Matt Lowry
Racer
Joined: Mar 2009
Posts: 316
Likes: 0
From: Fort Worth Texas
Smells like horsepower!! I gained 10HP over another car with almost the exact same mods. Same cam, LS2, and same dyno. The smell is not bad I love it but I have a cam also so it's more intense. Before the cam it was only in confined spaces like a garage that I would really notice the smell.
Instructor
Joined: Jun 2010
Posts: 160
Likes: 0
From: Spring Lake Michigan
Smells like horsepower!! I gained 10HP over another car with almost the exact same mods. Same cam, LS2, and same dyno. The smell is not bad I love it but I have a cam also so it's more intense. Before the cam it was only in confined spaces like a garage that I would really notice the smell.
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Melting Slicks
Joined: Oct 2010
Posts: 2,314
Likes: 4
From: Cape May, NJ; Guntersville, AL; Orange Beach, AL
Smells like horsepower!! I gained 10HP over another car with almost the exact same mods. Same cam, LS2, and same dyno. The smell is not bad I love it but I have a cam also so it's more intense. Before the cam it was only in confined spaces like a garage that I would really notice the smell.
Burning Brakes
Joined: Jun 2007
Posts: 875
Likes: 138
From: Little Egypt, USA
Not true.
To remain legal on the exhaust system you can only modify after the cats. Headers illegal, Headers with cats illegal.
On the engine you can change the fuel rail covers. Anything else not meeting factory specs illegal. Yes, according to the letter of the law even changing air intake system is illegal. Anything that could change emissions from the engine is illegal. So you guys that keep cats on for the sake of not being a law breaker are wasting your time.
Besides saving a few hp deleting the cats also save you about $400 for no cats and O2 sensor wire extensions.
You also get less tunnel heat and better sound.
To remain legal on the exhaust system you can only modify after the cats. Headers illegal, Headers with cats illegal.
On the engine you can change the fuel rail covers. Anything else not meeting factory specs illegal. Yes, according to the letter of the law even changing air intake system is illegal. Anything that could change emissions from the engine is illegal. So you guys that keep cats on for the sake of not being a law breaker are wasting your time.
Besides saving a few hp deleting the cats also save you about $400 for no cats and O2 sensor wire extensions.
You also get less tunnel heat and better sound.
Team Owner
Joined: Feb 2001
Posts: 27,228
Likes: 113
From: Short Hills, NJ
No? It's roughly 20%+ extra on an already expensive item. I suppose it's all relative though.
Not true.
To remain legal on the exhaust system you can only modify after the cats. Headers illegal, Headers with cats illegal.
On the engine you can change the fuel rail covers. Anything else not meeting factory specs illegal. Yes, according to the letter of the law even changing air intake system is illegal. Anything that could change emissions from the engine is illegal. So you guys that keep cats on for the sake of not being a law breaker are wasting your time.
Besides saving a few hp deleting the cats also save you about $400 for no cats and O2 sensor wire extensions.
You also get less tunnel heat and better sound.
To remain legal on the exhaust system you can only modify after the cats. Headers illegal, Headers with cats illegal.
On the engine you can change the fuel rail covers. Anything else not meeting factory specs illegal. Yes, according to the letter of the law even changing air intake system is illegal. Anything that could change emissions from the engine is illegal. So you guys that keep cats on for the sake of not being a law breaker are wasting your time.
Besides saving a few hp deleting the cats also save you about $400 for no cats and O2 sensor wire extensions.
You also get less tunnel heat and better sound.
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Both are illegal, but the catless smell and noise bothered me so much that I spend the time and money to put a catted X-pipe in there.
No difference in power. Made 700RWHP with cats.
No difference in power. Made 700RWHP with cats.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
.Long tube headers are illegal, by the definition of the law; it is illegal to relocate the stock cats even. Now whether that's a problem where you live or not is a completely different issue...
Burning Brakes
Joined: Jun 2007
Posts: 875
Likes: 138
From: Little Egypt, USA
That's true because the states don't really want to catch anyone and have tons of citizens complaining about the cost/being banned from the road. A simple visual inspection along with a "sniffer" up the tail pipe/OBD 2 code check would easily catch 99% of the violators, myself included.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
That's true because the states don't really want to catch anyone and have tons of citizens complaining about the cost/being banned from the road. A simple visual inspection along with a "sniffer" up the tail pipe/OBD 2 code check would easily catch 99% of the violators, myself included.
Burning Brakes
Joined: Jun 2007
Posts: 875
Likes: 138
From: Little Egypt, USA
