I’m looking to get an off-road H pipe for my 2004 v6 mustang, it will have no cats. I’m going to get an andapter for the o2 sensor so it won’t pop a code. By removing the cats , will it cause any problems? Will I have to get a tune? Right now my car is running like crap I think because one of my cats is broken, and it’s having an offset back pressure. Let me know if I’m wrong, I need advice