High flow cats vs no cats - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

steven32708 · 02-08-2011, 01:53 PM

Is anyone running no cats ("off road pipes") without a tune. Im trying to decide between high flow cats and off road pipes by adm. The off road pipes are cheaper and louder, so those would be optimal but i cant get a tune so i need to know if they throw codes or anything like that. I searched, but couldnt find a lot of information relevant to this. Thanks.

DHSS · 02-08-2011, 01:59 PM

From what I hear, you are going to throw a code either way b/c of the excess of flow from the new headers. Im in the same debate, always have done off road pipes on my GT's in the past and had to trick the computer with wires in the o2 sensors, but not sure about these 5th Gens, b/c I never ran offroad pipes on either of my C6's.

Fishdadddy · 02-08-2011, 02:10 PM

You will get a code with the offroad pipes. I have the Solo High Flow Cats and have no code issues yet. 600+ miles amd I'm not the only one . Do a search on high flow cats

first one · 02-08-2011, 04:07 PM

No code with solo HF cats.

caverman · 02-08-2011, 04:25 PM

You'll probably get a code with the off-road pipes since you are basically removing the cats. You'll get a CEL basically saying the cats are working properly.

From my understanding the sensor in front of the cat take a measurement and the sensor from behind the cat takes another mesurement. If the second measurment is not cleaner within a certain range then it will throw a code.

Since you would be removing the cats then the air will be the exact same between the first and second sensor.....thus a CEL is thrown.

That's the way it was explained to me....and it makes sense.

By going with a HF cat setup from JBA or SOLO then the air on the second sensor should be cleaner than the first one within the allowed range. If installed properly they shouldn't throw a code.

TaylorRyanSS · 02-08-2011, 05:29 PM

No CELs with my JBA high flow cats and its been around 800 miles *knock on wood*

unclead3008 · 02-08-2011, 06:27 PM

No CEL's yet, I have Kooks Longtubes and Kooks High Flow Cats. I don't have many miles on them...probably 125 miles. Car is put away for the winter.

If a CEL comes up, I will take my car to get it tuned.

Bad70supreme · 02-08-2011, 06:36 PM

With long tubes you are going to get a cel no matter what, just a matter of time! You might as well go no cats, when it comes time for smog test put the manifolds and cats back on for the test and the cel will go away. If you get it tuned then you dont need to worry about that, but if you dont tune then you will have to do the swap every few years. No big deal if you ask me, just a little work!

02-08-2011, 01:53 PM	#1
steven32708 Drives: 2010 2SS/RS IOM LS3 Camaro Join Date: Aug 2010 Location: Orlando Posts: 28	High flow cats vs no cats Is anyone running no cats ("off road pipes") without a tune. Im trying to decide between high flow cats and off road pipes by adm. The off road pipes are cheaper and louder, so those would be optimal but i cant get a tune so i need to know if they throw codes or anything like that. I searched, but couldnt find a lot of information relevant to this. Thanks.

02-08-2011, 04:07 PM	#4
first one Drives: SSRS - black, GFX, SSX wheels Join Date: Aug 2009 Location: IN Posts: 936	No code with solo HF cats. __________________

02-08-2011, 04:25 PM	#5
caverman Drives: '69 SS Convertible Join Date: May 2009 Location: DFW, TX Posts: 7,111	You'll probably get a code with the off-road pipes since you are basically removing the cats. You'll get a CEL basically saying the cats are working properly. From my understanding the sensor in front of the cat take a measurement and the sensor from behind the cat takes another mesurement. If the second measurment is not cleaner within a certain range then it will throw a code. Since you would be removing the cats then the air will be the exact same between the first and second sensor.....thus a CEL is thrown. That's the way it was explained to me....and it makes sense. By going with a HF cat setup from JBA or SOLO then the air on the second sensor should be cleaner than the first one within the allowed range. If installed properly they shouldn't throw a code. __________________ *-2010 Camaro* 2SS \| M6 \| VR w/White Stripes \| 1 3/4" KOOKS - 3" Magnaflow \| LPE 3.91 gears \| ADM tuned \| Halltech w/ADM Scoop \| Spohn/BMR Trailing Arm/Toe Rod \| BC Coilovers\| Pedders FE4 ZL1 swaybars \| Cradle/Diff/Radius Rod bushings \| VMax TB \| Morimoto Projectors \| MGW shifter \| Red Calipers Build Journal

02-08-2011, 05:29 PM	#6
TaylorRyanSS COTW: 12/13/10 Drives: 1969 Camaro Join Date: Feb 2008 Location: Orange County, CA Posts: 7,880	No CELs with my JBA high flow cats and its been around 800 miles knock on wood __________________ "Are you one of those boys who prefer cars to women? - I'm one of those boys that appreciates a fine body, regardless of the make." 1969 CAMARO JOURNAL: http://www.camaro5.com/forums/showthread.php?t=341239 \| FACEBOOK: http://www.facebook.com/taylor.ryan.apt \| GRAPHIC DESIGN: www.aptdesigns.net

02-08-2011, 06:36 PM	#8
Bad70supreme Drives: 2010 aqua blue SS/RS M6 Join Date: Feb 2010 Location: plainfield, IL Posts: 2,706	With long tubes you are going to get a cel no matter what, just a matter of time! You might as well go no cats, when it comes time for smog test put the manifolds and cats back on for the test and the cel will go away. If you get it tuned then you dont need to worry about that, but if you dont tune then you will have to do the swap every few years. No big deal if you ask me, just a little work! __________________ 10.91 at 122 H/C stock block N/A

02-08-2011, 01:59 PM	#2
DHSS Drives: Empty Join Date: Jan 2011 Location: Grand Prairie, Tx Posts: 454	From what I hear, you are going to throw a code either way b/c of the excess of flow from the new headers. Im in the same debate, always have done off road pipes on my GT's in the past and had to trick the computer with wires in the o2 sensors, but not sure about these 5th Gens, b/c I never ran offroad pipes on either of my C6's.

02-08-2011, 02:10 PM	#3
Fishdadddy Drives: 2010 2SS/RS ; 1970 Firebird Formula Join Date: Jan 2010 Location: West Palm Beach Posts: 1,252 View My Garage	You will get a code with the offroad pipes. I have the Solo High Flow Cats and have no code issues yet. 600+ miles amd I'm not the only one . Do a search on high flow cats

02-08-2011, 06:27 PM	#7
unclead3008 Drives: White 1SS Join Date: Apr 2010 Location: Michigan Posts: 34	No CEL's yet, I have Kooks Longtubes and Kooks High Flow Cats. I don't have many miles on them...probably 125 miles. Car is put away for the winter. If a CEL comes up, I will take my car to get it tuned.

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