im thinking of picking up a set of art pipes for my g but before I do I wanted to ask a couple of questions to you guys.First of all,currently my car’s cats are welded on to my y pipe due to the fact that my cats were so rusty it damn near impossible to get them off with deteriorating any ways would it be a smart move to recut the y pipe and welded it on the new art pipes? Or would that be a dumb move? As for question 2 do art pipes cause the cel light without non foulers? Thank you guys for the responses

I currently have a manzo y pipe (cheap Megan sub brand) along with a z1 single exit anyways would it be bad to weld the art pipes to my manzo y pipe?