Decisions: Cat or Catless???
Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
Decisions: Cat or Catless???
I am interested in this exhaust system:
http://www.vettesupply.com/products/...st-System.html
My question is whether I should go catless and delete the air and egr, or get the high flow cats and other connections.
What my project will look like when I am done is mega ported plenum, slp runners, base. 1.6rrs, cam, exhaust, tune. I just need to button down what cam and exhaust system I will go with. I am closer to pulling the trigger on the exhaust.. Hence this thread.
I don't mind spending the money for this system. I have heard really good things about it and it looks like a well put together system.
http://www.vettesupply.com/products/...st-System.html
My question is whether I should go catless and delete the air and egr, or get the high flow cats and other connections.
What my project will look like when I am done is mega ported plenum, slp runners, base. 1.6rrs, cam, exhaust, tune. I just need to button down what cam and exhaust system I will go with. I am closer to pulling the trigger on the exhaust.. Hence this thread.
I don't mind spending the money for this system. I have heard really good things about it and it looks like a well put together system.
Race Director
Joined: Sep 2001
Posts: 14,685
Likes: 753
From: NEwhere Ohio
Here's what I recommend:
Run w/o cats and see if you can tolerate the exhaust odor.
If you can, then leave be (w/o cats).
If its nasty then add on random tech hi flow metal substrate cats.
If you got any kinda cam, they puke out fumes (unburned hc) at idle. I'm talking the kinda smell that sticks to your clothes and makes my whole house stink e ven though you just had it idling in the garage for 20 seconds.
Run w/o cats and see if you can tolerate the exhaust odor.
If you can, then leave be (w/o cats).
If its nasty then add on random tech hi flow metal substrate cats.
If you got any kinda cam, they puke out fumes (unburned hc) at idle. I'm talking the kinda smell that sticks to your clothes and makes my whole house stink e ven though you just had it idling in the garage for 20 seconds.
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
Here's what I recommend:
Run w/o cats and see if you can tolerate the exhaust odor.
If you can, then leave be (w/o cats).
If its nasty then add on random tech hi flow metal substrate cats.
If you got any kinda cam, they puke out fumes (unburned hc) at idle. I'm talking the kinda smell that sticks to your clothes and makes my whole house stink e ven though you just had it idling in the garage for 20 seconds.
Run w/o cats and see if you can tolerate the exhaust odor.
If you can, then leave be (w/o cats).
If its nasty then add on random tech hi flow metal substrate cats.
If you got any kinda cam, they puke out fumes (unburned hc) at idle. I'm talking the kinda smell that sticks to your clothes and makes my whole house stink e ven though you just had it idling in the garage for 20 seconds.
I HATE THAT SMELL,my cloth,my hairs,and for sure my neighbours hate me
...probably my car is running rich,and burns some oil too,the result is an intolerable smell,my cat was deleted by previous owner ,probably an hi flow cat is the best
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
I agree with the above , it will stink without cats.. The cats now days are so open you can see right through them, not much restriction at all on mine , just looks like a screen in the center....WW
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
Thats a bubba myth that cats kill your power on a steet car. if for NO OTHER reason, consider the guy behind you and the people that you subject to the stinky nasty air that you make as you drive. Some folks will laugh and say "so what, or screw them, its MY car"...tell that to YOUR pregnant WIFE as she inhales your polluted exhaust. THAT seems to make a difference for most with any sort of a conscience. 
Would you make YOUR family breath that dirty exhaust? Then don;t make mine do that please. Cats solve that problem. Not perfect by any means but they are a great improvement over open exhaust.
It amazes me that we keep seeing this question on ALL the boards. When folks go to a track they are aware of what they are about to subject them selves to...but on a drive to Church, they did not ask for stinky polluted air for their kids to inhale.
The cat myth was true 40 yrs ago...it was like trying to exhale thru a kitchen sponge. Now they are so free flowing, near zero restriction that its NOT a big deal. You can SEE thru them. Hows that block exhaust gas flow?
Grow with the times...move into the 21st century. Cats are harmless to street cars and the air mngt system does have certain benefits to the motor.
Off the soap box to go work on the car.....
Would you make YOUR family breath that dirty exhaust? Then don;t make mine do that please. Cats solve that problem. Not perfect by any means but they are a great improvement over open exhaust.
It amazes me that we keep seeing this question on ALL the boards. When folks go to a track they are aware of what they are about to subject them selves to...but on a drive to Church, they did not ask for stinky polluted air for their kids to inhale.
The cat myth was true 40 yrs ago...it was like trying to exhale thru a kitchen sponge. Now they are so free flowing, near zero restriction that its NOT a big deal. You can SEE thru them. Hows that block exhaust gas flow?
Grow with the times...move into the 21st century. Cats are harmless to street cars and the air mngt system does have certain benefits to the motor.
Off the soap box to go work on the car.....
Tech Contributor
Joined: Oct 2011
Posts: 525
Likes: 9
From: Annapolis MD
You can put on long tube headers, delete the cats, and still retain your emissions controls. Or not. It's up to you.
http://www.stainlessworks.net/produc...ead-pipes.html
http://www.stainlessworks.net/produc...ead-pipes.html
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
Thank you everyone for your input. My driving will be mostly street, with the occasional autocross. Since I will probably never be putting down enough power or screaming the rpm to the high heavens to realize any advantages with catless, I will opt for hi flow cats.
Tech Contributor
Joined: Oct 2011
Posts: 525
Likes: 9
From: Annapolis MD
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
A link to headers does not explain how the removal of converters allows you to retain emission's controls. WTF?
Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Just figured out what he meant. To be more clear, he could have said you can delete cats but retain the AIR hook-up. Probably not for the average person since those deleting cats would likely delete AIR too. And, the AIR system is in place to heat up your cats faster. Why would you need/want that w/o cats?
Last edited by GREGGPENN; Mar 5, 2012 at 12:08 AM.
