Need H-Flow cats?
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From: Blaine Minnesota
Need H-Flow cats?
I will be having LG longtube headers installed on my 2008 LS3. I have searched the forums and can't get a definitive answer at all... If I go with NO CATS how "strong" will the fuel odor be if any?
ALSO- Does running with no cats have any lasting negative effects on the O2 sensors? I only want to do it once, as much as I really want the car louder I don't want a strong fuel odor all the time. (NPP will help control sound when needed)
Thanks!
ALSO- Does running with no cats have any lasting negative effects on the O2 sensors? I only want to do it once, as much as I really want the car louder I don't want a strong fuel odor all the time. (NPP will help control sound when needed)
Thanks!
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From: Mcpherson kansas
Correct me if I am wrong but isn't it illegal to run with no cats? I had a similiar conversation with my dad about dropping the cats so i could make for a loud deep no muffled sound on my 08 also and run 31" glasspacks like we did on my 86 dodge pickup. But apparently no cats is illegal, so I couldn't/won't be able to do that. From an emissions standpoint you are going to fail your state inspection depending on where you live. Have you considered high flow cats? I think thats the closest to no cats as you are going to get to no cats unless your car is considered race only and not tagged for the street...but thats just a guess on my part. There are alot of articles about exhaust on here. Feel free to correct me.
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From: Mcpherson kansas
That didn't really answer your question, but as far odor goes....I can't honestly answer that, but I would assume you would have a bit more than normal due to less restriction, IMHO I wouldn't worry about the smell of spent gases as long as they aren't coming into your car, if they are just drive faster to escape them. 
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From: ontario
Hi i got m6 2008 ls3 c6 and i went with kooks header with X pipe and GESI cats made by global emission in Whitby Ontario Canada butt deals with all big manufacture they are new cats . Call redline in Scarborough Ontario canada 905 292 1431 thats there shop. they work hi performance cars and he races cars his name is Eric latino he's all over youtube as well. 
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Joined: Jan 2011
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From: Blaine Minnesota
Correct me if I am wrong but isn't it illegal to run with no cats? I had a similiar conversation with my dad about dropping the cats so i could make for a loud deep no muffled sound on my 08 also and run 31" glasspacks like we did on my 86 dodge pickup. But apparently no cats is illegal, so I couldn't/won't be able to do that. From an emissions standpoint you are going to fail your state inspection depending on where you live. Have you considered high flow cats? I think thats the closest to no cats as you are going to get to no cats unless your car is considered race only and not tagged for the street...but thats just a guess on my part. There are alot of articles about exhaust on here. Feel free to correct me.
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From: Saint Albans, WV
I'll put it this way. When I had the offroad I had to "sprint" out of the garage to try to flee the clothing and skin penetrating odor! Never worked though, I couldn't run fast enough.
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From: Blaine Minnesota
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From: Blaine Minnesota
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Joined: Jan 2011
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From: Blaine Minnesota
FELLAS! I see and read so many posts, please take the 30 seconds to respond. It will truly be my make or break decision on going with or without hi-flow CATS! I really only want to do the mod ONCE! thanks!
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From: Blaine Minnesota
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From: NorCal
St. Jude Donor '09
07 H/C base c6 mith OBX LT's and Corsa Xtreme and obviously a tune. My cabin sometimes makes me dizzy and every single time I drive the car my wife tells me to shower and change when I get home. I had this same question BEFORE I did the H/C when it was just LT's and exhaust....I should have put cats on then, they are certainly on my future to do list, it's almost to the point where it's unbearable.
Things to consider.....I live in LA (ton of traffice/stop and go) while your moving its not noticeable but when you stop at a light the fumes creep into the cabin. I have had friends behind me comment about the smell (again BEFORE i did the H/C).
Bottom line, save the headache and get the HF cats, you can always take them off, but then again, why would you take them off?
Things to consider.....I live in LA (ton of traffice/stop and go) while your moving its not noticeable but when you stop at a light the fumes creep into the cabin. I have had friends behind me comment about the smell (again BEFORE i did the H/C).
Bottom line, save the headache and get the HF cats, you can always take them off, but then again, why would you take them off?
Instructor
Joined: May 2012
Posts: 116
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From: Montreal
Hope this helps you decide. I would recommend holding onto your cats in Case you regret that mod you can always put them back on.
I suggest you get Hi flow cats.
Last edited by 69 Rebel; Mar 21, 2013 at 09:03 PM.