Cutting out cats question....

[ShadowRejects]

if i cut the cat off my truck, what would i do with the o2 sensor, and should i stick an exhaust tube in the cat's place so it leads the fumes through the rest of the exhaust?

 

[ChrisAU]

Well you definitely want to weld a pipe in place if you do that. I promise. That is not up for debate.

As for the O2's...not sure. I wouldn't recommend doing it at all.

 

[ShadowRejects]

Well you definitely want to weld a pipe in place if you do that. I promise. That is not up for debate.

As for the O2's...not sure. I wouldn't recommend doing it at all.

Thanks man.

 

[Dszx13]

None of the z71s I've owned had cats. All have been true dualed but all still had o2s in the manifolds. Never had a engine light issue for it between the 3

 

[LoudnLifted88]

i cut the cat outa both of my 94s with no problem just weld some pipe in place

 

[ChrisAU]

Ahh I was thinking he had a Vortec, you'll be fine O2 wise with a TBI. But definitely have an exhaust shop do it and put a piece of pipe there.

 

[Gatorboy]

Yeah I welded my high flow cat in, and by high flow cat I mean 2.5" pipe. No problems with mine, just a louder truck now.

 

[1993-Sierra-Z71]

My cat Gutted itself one day and i believe '93s dont even have O2's, i never really payed attention haha

 

[Dszx13]

Yea on the manifold. My 91 gmc an 95 chevy did as well

 

[volunteerff21]

Pre 96' is OBDI, one 02 sensor, pre-cat.

96-00 is OBDII, two 02 sensors, one pre-cat, and one post cat.

On the pre 96' all you have to do is weld a piece of pipe in place of the cat and your done. No worries

96-00 you'll have to either run an 02 sensor simulator or an 02 sensor extender for the post-cat sensor if you don't want your check engine light to come on. Some people have been able to do neither and be ok but I've never been that lucky. Depends on the truck I guess.