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.

Anyone know. My cat is clogging, want to take it out and pipe it. Would any problems occure

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).

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.

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...

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

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.