Question: Why high flow cats over straight pipe?
Thread Starter
Pro
Joined: Aug 2001
Posts: 714
Likes: 0
From: Orlando FL
Question: Why high flow cats over straight pipe?
Here in FL, there is no inspection, but even with the "high flow" cats, if we were to get inspected, wouldnt they still fail it do to the high amount of volume still getting through?
Is there another reason?
Thanks
Is there another reason?
Thanks
Burning Brakes
Joined: Nov 2002
Posts: 1,018
Likes: 52
From: Deltona Fl.
Hi flow cats
You need some back pressure and high flow cats will still give you
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
Race Director
Joined: Nov 2003
Posts: 11,061
Likes: 38
From: Menifee CA
You need some back pressure and high flow cats will still give you
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
Burning Brakes
Joined: Sep 2001
Posts: 893
Likes: 38
From: ATX
You need some back pressure and high flow cats will still give you
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
enough restriction for that. I have heard that straight pipes will
give off an exhaust order. Most of the high flows will pass emission
test. I know random and bassani's do. A good set of long tube
headers with the high flows are the ticket. Mufflers don't really
make that much differance, just pick the ones you like the sound
of.
Pro
Joined: Sep 2003
Posts: 670
Likes: 1
From: charlotte nc
The positive effect on the environment is not BS. I remember what cars smelled like in the 50's and 60's as well as what the air looked and smelled like in our cities. I'm thankful for the cleaner air we have today because of the "environmental BS".
Race Director
Joined: Sep 2004
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From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Also, do you remember the 70s when 400 HP cars were made to have emissions equipment? The power dropped to like 1/2.
CATS do their job, that is why they are covered under their own warranty by the FEDs. Look in your warranty booklet.
Not to mention leaded gas.
Pro
Joined: Jan 2005
Posts: 559
Likes: 1
From: Lenexa Kansas
Your kidding right? A car from now compared to a car in the 60s, the car from now puts out like 70% less emissions.
Also, do you remember the 70s when 400 HP cars were made to have emissions equipment? The power dropped to like 1/2.
CATS do their job, that is why they are covered under their own warranty by the FEDs. Look in your warranty booklet.
Not to mention leaded gas.
Also, do you remember the 70s when 400 HP cars were made to have emissions equipment? The power dropped to like 1/2.
CATS do their job, that is why they are covered under their own warranty by the FEDs. Look in your warranty booklet.
Not to mention leaded gas.
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From: Janesville Wisconsin
Melting Slicks
Joined: Mar 2006
Posts: 3,055
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From: Jax Florida
By saying 'BS', I didn't mean the cats don't work. It's 'BS' to people who really don't care and will rip off all off, like myself. We don't have inspections in my state so the cats are the first thing to be removed. I like the sound, not to mention the power gained over the stock stuff.
Safety Car
Joined: Mar 2006
Posts: 4,448
Likes: 4
From: Sarasota Florida
St. Jude Donor '06
With modern fuels, cars without cats will stink. It ain't the old days anymore.
Find a local Corvette club and go on a run and follow a car without cats. It will make your eyes water after a while.
I was going to go catless, in fact I spent $400 extra (!!!) to have my headers made up with a catless x-pipe in addition to the standard one with hi-flow cats. While I was waiting for delivery I drove over a hundred miles following a club member with a cammed and catless Z06. It was nasty. I'm practically an anti-environmentalist but I just couldn't do it to my fellow motorists. The $400 x-pipe makes a nice wall ornament.
Choose your choice. But running catless will stink, and no, it won't be the smell of a high-compression engine on Sunoco 260.
Find a local Corvette club and go on a run and follow a car without cats. It will make your eyes water after a while.
I was going to go catless, in fact I spent $400 extra (!!!) to have my headers made up with a catless x-pipe in addition to the standard one with hi-flow cats. While I was waiting for delivery I drove over a hundred miles following a club member with a cammed and catless Z06. It was nasty. I'm practically an anti-environmentalist but I just couldn't do it to my fellow motorists. The $400 x-pipe makes a nice wall ornament.
Choose your choice. But running catless will stink, and no, it won't be the smell of a high-compression engine on Sunoco 260.
Race Director
Joined: Apr 2001
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From: Saint Augustine, FL
Mid-TN Events Coordinator
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
I remember seeing an article about Tony Mamo or another LS1tech vendor doing back-to-back dyno tests of high flow cats and no cats. They found like 3 or 4whp difference when taking off the cats. That's not to disagree with your statement about the drop in power in the 70's, but just to note that today's high flow cats don't cost much power.
If anything, removing the CAT's cost you torque.
Thread Starter
Pro
Joined: Aug 2001
Posts: 714
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From: Orlando FL
I have never heard of anyone being "jailed" only because of exhaust..
Let's not go off topic. I believe the question has been answered.
Le Mans Master
Joined: Sep 2006
Posts: 5,256
Likes: 1
From: Charlotte NC
St. Jude Donor '08-'09-'10-'11
You asked "Why high flow cats over straight pipes?" sooo Im pretty sure they just gave you another example of why you should go to cat route and not going off topic....
Burning Brakes
Joined: Sep 2001
Posts: 893
Likes: 38
From: ATX
Nope.
Zing!
But also I agree with the claim a catless car will 'stink', and I'd say I'm toward the anti-environmentalist pole. More like make your eyes water, but yeah, the smell/irritating nature of the exhaust is pretty annoying when you're sitting at a light.
I'm of the opinion that there should be a reasonably expensive tax that one could pay to legally remove emissions equipment/install whatever cam they want. 98% of the population wouldn't do it, so there would be a neglegible change in the urban pollution blanket, and gearheads wouldn't have to dread inspections.
Originally Posted by Ryan L
If anything, you should shove banana's in your tail pipes and your torque will become infinite!!
Zing!But also I agree with the claim a catless car will 'stink', and I'd say I'm toward the anti-environmentalist pole. More like make your eyes water, but yeah, the smell/irritating nature of the exhaust is pretty annoying when you're sitting at a light.
I'm of the opinion that there should be a reasonably expensive tax that one could pay to legally remove emissions equipment/install whatever cam they want. 98% of the population wouldn't do it, so there would be a neglegible change in the urban pollution blanket, and gearheads wouldn't have to dread inspections.
Last edited by nitrojunky; May 12, 2007 at 07:43 PM.