cat removal question
Thread Starter
7th Gear
Joined: Aug 2012
Posts: 7
Likes: 0
From: valley stream ny
cat removal question
05 ls2 with custom headers , x pipe and high flow cats ! i wanna take the cats off will i run into any issues as far as car not running properly i do not see any o2 sensors after the cats but there is one in each collector before the cat any input is appreciated
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
If you are already running hiflow cats and don't have any CEL's then you already have a computer mod (tune) done. Removing the cats might require a further tune.
You will definitely fail a visual inspection with headers and no cats.
You will definitely fail a visual inspection with headers and no cats.
Drifting
Joined: May 2008
Posts: 1,505
Likes: 7
From: Jacksonville FL
I flip flop on this choice every week. One day I'll pull them and figure it out.
It should run fine without cats. It will be louder, probably have a little raspier sound, smell a little more fuel but honestly high flows are pretty open anyways. On my old Mustang I pulled the cats and swapped in a set of resonators. Had a little deeper sound but was still decently loud comapred to having cats.
It should run fine without cats. It will be louder, probably have a little raspier sound, smell a little more fuel but honestly high flows are pretty open anyways. On my old Mustang I pulled the cats and swapped in a set of resonators. Had a little deeper sound but was still decently loud comapred to having cats.
Last edited by Kadorja; Dec 5, 2012 at 10:08 PM.
Pro
Joined: Aug 2007
Posts: 562
Likes: 2
From: Jacksonville FL
I just installed some B&B long tubes on my LS3 last week. I kept the factory x pipe (2008 - no cats in the x pipe) and the headers attached perfectly to the x pipe. The B&B headers had two O2 bung holes on each collector pipe. The upper hole I connected my upper O2 sensors. the lower hole (were only talking about 1/2 inch away) I installed the Big Daddy's Cell fix piece and then connected the lower O2 sensors into it.
No codes, and no smell either. Very happy with the outcome. Not sure if I will ever bother to get a tune.
No codes, and no smell either. Very happy with the outcome. Not sure if I will ever bother to get a tune.
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Pro
Joined: Apr 2012
Posts: 521
Likes: 14
From: Denham Springs Louisiana
Instructor
Joined: Jun 2011
Posts: 153
Likes: 0
From: Honolulu Hawaii
I just installed some B&B long tubes on my LS3 last week. I kept the factory x pipe (2008 - no cats in the x pipe) and the headers attached perfectly to the x pipe. The B&B headers had two O2 bung holes on each collector pipe. The upper hole I connected my upper O2 sensors. the lower hole (were only talking about 1/2 inch away) I installed the Big Daddy's Cell fix piece and then connected the lower O2 sensors into it.
No codes, and no smell either. Very happy with the outcome. Not sure if I will ever bother to get a tune.
No codes, and no smell either. Very happy with the outcome. Not sure if I will ever bother to get a tune.
Drifting
Joined: May 2008
Posts: 1,505
Likes: 7
From: Jacksonville FL
I wouldn't of traded that sound for anything else... now with the Vette I'm not sure how good it will sound but you can always change it back so why not?