* yup...one in the header and one in the cat, that is if your exhaust isn't to where the cat is in the header...i mean like on my stock exhaust in my dx coupe 96 came with ad16y7, the cat was inside the header..but after i replaced my exhaust with a full racing exhaust it moved the cat back...just plug one in the header and one in another spot...doesn't really matter...you could just bypass that shit all together