I have a 98 dx with the stock exhaust that has the cat right after the manifold. Will i have any problems if i try to put a aftermarket header for the same year but the ex model? I know the cat is in different places so I wouldnt have one if i put the aftermarket one on. What about my o2 senors?

 

I suggest reading the stickied FAQ thread at the very top of this forum. Then you will find this thread - [FAQ] What parts are interchangeable for all 92-00 Civics?

 

Thanks. For some reason I never see those when I first look.