Catalytic Question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Fishdadddy · 03-28-2010, 05:55 PM

What are the positives and negatives of not running cats? Even high flow cats. There are no emmision inspections in South Florida.

I'm getting ready to install a header back exhaust. should I just leave the cats out and get it tuned as such?

*Mr. Wyndham* · 03-28-2010, 05:56 PM

Somewhere on here a performance shop stated that gains from running no cats was minimal at best. Wish I could find it...

EDIT: Here it is!! Good 'ole Jannety:
http://www.camaro5.com/forums/showth...onverters+flow
read towards the end.

Fishdadddy · 03-29-2010, 10:14 AM

So no horsepower gains. But I could save the money for the cats. Are there any negative effects or problems?

Mr_Draco · 03-29-2010, 11:05 AM

Quote:

Originally Posted by Fishdadddy

So no horsepower gains. But I could save the money for the cats. Are there any negative effects or problems?

Even if you don't have emissions testing, you can still get fines for removing them (ranging anywhere from $500-$5,000

), will still fail visual inspections (which shops are still suppose to do during inspections even if they don't have to do emissions), and you can get noise ordinance tickets as running no cats is loud as hell.

Imo the $150-$200 you spend on buying them is cheaper then the possible fines you can get in the future.

RedJewel2SS · 03-29-2010, 11:46 AM

best bet is to get a header kit with high flow cats... that way you get the visual and mechanical effects of having them, and the performance gains of not having them... kind of a compromise between keeping it legal and getting the most hp out of the engine.

hypurone · 03-29-2010, 12:26 PM

Plus you can end up with a very nasty film on the back of the car with no cats. Been there, done that....

It does come off with a little effort but still a PITA

Russell James · 03-29-2010, 12:58 PM

Some cars really stink without cats. Must be something in the efi programming, but some cars gas you out with no cats. The safest best is a complete system with cats, then you can always get some off road pipes also to try once in a while. But if you buy a complete system, including the race cats isn't much more $$$, and they flow dang near the same as without.

Fishdadddy · 03-29-2010, 01:33 PM

OK that pretty much answers that question. Thank You for the info.

Think I'll just get the high flows.

By the way. We don't have car inspections down here. Visual or otherwise.

axis · 03-29-2010, 06:30 PM

Quote:

Originally Posted by Dragoneye

Somewhere on here a performance shop stated that gains from running no cats was minimal at best. Wish I could find it...

EDIT: Here it is!! Good 'ole Jannety:
http://www.camaro5.com/forums/showth...onverters+flow
read towards the end.

Unless I read it wrong, he compared no cats to highflow cats. What would be the difference between STOCK cats and no cats?

03-28-2010, 05:55 PM	#1
Fishdadddy Drives: 2010 2SS/RS ; 1970 Firebird Formula Join Date: Jan 2010 Location: West Palm Beach Posts: 1,252 View My Garage	Catalytic Question What are the positives and negatives of not running cats? Even high flow cats. There are no emmision inspections in South Florida. I'm getting ready to install a header back exhaust. should I just leave the cats out and get it tuned as such?

03-28-2010, 05:56 PM	#2
Mr. Wyndham I used to be Dragoneye... Drives: 2018 ZL1 1LE Join Date: Jan 2007 Location: Buffalo, NY Posts: 31,876 View My Garage	Somewhere on here a performance shop stated that gains from running no cats was minimal at best. Wish I could find it... EDIT: Here it is!! Good 'ole Jannety: http://www.camaro5.com/forums/showth...onverters+flow read towards the end. __________________ *"Keep the faith."* - Fbodfather

03-29-2010, 11:46 AM	#5
RedJewel2SS 12.23s@113mph Drives: 2SS/RS, A6, just a few bolt ons Join Date: Jul 2009 Location: Houston, TX Posts: 1,197	best bet is to get a header kit with high flow cats... that way you get the visual and mechanical effects of having them, and the performance gains of not having them... kind of a compromise between keeping it legal and getting the most hp out of the engine. __________________ RIP Cammie 7/15/2009 - 4/1/2011

03-29-2010, 12:26 PM	#6
hypurone I'm not totally useless.. Drives: ... Join Date: Sep 2009 Location: ... Posts: 2,008 View My Garage	Plus you can end up with a very nasty film on the back of the car with no cats. Been there, done that.... It does come off with a little effort but still a PITA __________________ "You were really flyin' when I passed you back there!" - Born on 10/05/09 MyCamaroBuildInfo

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03-29-2010, 10:14 AM	#3
Fishdadddy Drives: 2010 2SS/RS ; 1970 Firebird Formula Join Date: Jan 2010 Location: West Palm Beach Posts: 1,252 View My Garage	So no horsepower gains. But I could save the money for the cats. Are there any negative effects or problems?

03-29-2010, 12:58 PM	#7
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Some cars really stink without cats. Must be something in the efi programming, but some cars gas you out with no cats. The safest best is a complete system with cats, then you can always get some off road pipes also to try once in a while. But if you buy a complete system, including the race cats isn't much more $$$, and they flow dang near the same as without.

03-29-2010, 01:33 PM	#8
Fishdadddy Drives: 2010 2SS/RS ; 1970 Firebird Formula Join Date: Jan 2010 Location: West Palm Beach Posts: 1,252 View My Garage	OK that pretty much answers that question. Thank You for the info. Think I'll just get the high flows. By the way. We don't have car inspections down here. Visual or otherwise.