: Cat



pimpjuice01
09-24-04, 07:17 PM
On the N* can you replace the catalyst with straight pipe without a problem. Or is there sensors along the way. My cat is bad but I don't want to replace it.

pimpjuice01
09-29-04, 09:20 PM
Anyone know. My cat is clogging, want to take it out and pipe it. Would any problems occure

01STS
09-29-04, 10:42 PM
You shouldn't have a problem if you have a 95 or older car. 96 and up cars will trip a check engine code when the cat is removed (rear o2 sees the same voltage as the primary o2).

eldorado1
09-29-04, 11:38 PM
Don't they have post-cat o2 sensors? I don't know off the top of my head. Why not just replace them? They're only like $30 a piece... btw - replacing them with pipe will make your car louder.

Night Wolf
09-30-04, 12:15 AM
Don't they have post-cat o2 sensors? I don't know off the top of my head. Why not just replace them? They're only like $30 a piece... btw - replacing them with pipe will make your car louder.

Also illegal...

pimpjuice01
10-01-04, 01:16 AM
I got quoted like 300$ for the cat. Not really Illegal here, we don't even ever have emission tests. Canada Calgary. So replacing it with pipe is no problem 94 STS

kcnewell
10-01-04, 12:41 PM
It shouldn't cause a problem replacing the cat with a test pipe on a 94. Only the 96 and later engines had the OBD2 system that has pre- and post-cat O2 sensors that test the cat efficiency. Eliminating the cat on a 96 or later will cause a persistent code to set but not on a 94.