I’m going to be installing some high flow cats on my 05 v6 mustang with a true dual exhaust. The cats I’m about to but have holes for the bottom two O2 sensors but not the top two. What should I do about the top ones, can I just attach a MIL eliminator to both of them and tie them away or do they need to be reading the exhaust? If i need to drill some holes and weld some stuff I can do that but I want to know what the best way to go is.