Is the cat right at the end of the exhaust manifold on a d series motor. Thats what it looks like anyway. Its a big round deal that is bolted directly to the manifold and then the exhaust piping comes out of it. ?

 

its part of the exhaust manifold under the heat shield

 

ok, thats it then. Do you not use a cat with an hf mani adapter plate deal then

 

hell no

 

So there is no cat at all? I didnt realize that. How does it pass inspection then. I thought most states required a catty to pass.

 

then use one off a dx or ex.

 

u have to get an ex cat or any other cat and get it attached past the downpipe, then get your catback cut and shortened hten welded to the back of the cat, definitely tkae it to an exhaust shop

 

DX cat sucks. It's called a pre-cat and it's built into the manifold. What you can do if you want a header and exhaust is buy an EX header, cat, and EX catback exhaust system and it'll all fit together perfectly but you will have to extend the secondary o2 sensor wires and possibly the primary sensor wires depending on where the primary o2 bung is located on the header. It SHOULD be underneath by the colletor, before the cat, but some shitty headers have them higher up on one of the runners.

primary sensor goes before the cat
secondary sensor goes after the cat.

easy as pie!