Why does the stock h pipe have 4 cats and not 2? I am currently trying to pass CA. smog and trying to see if it is easier to try and put back my stock h pipe with 4 cats, or if I should just keep my offroad x and weld some cats on the x. Would I have to weld 4 cats or just 2 like all aftermarket catted h's and x's. All this because my stupid MIL eliminators worked for shit and my check engine comes on.