The previous owner of my car took off the main cats which caused the check engine light to go on. I was looking for a way to get rid of it without having to put the main cats back on because I love the way it sounds and I found those MIL eliminators. My friend said they may not work because you need an H or X pipe for those to work. Is it possible to have them work without an H or X pipe? Or could I get a chip to get rid of the check engine light and I could get some extra power from a chip anyways. Let me now what you think. Thanks.