A buddy of mine is upgrading his mid-pipe on his 2004 Redfire Coupe and is selling his bassani catted x-pipe for $175. It has four cats I believe. No tears or holes. He does not know when the previous owners slapped it on. His Cobra has 75,000 miles on it. I have a few questions: 1) Will it fit my 99 Cobra? I saw that Bassani has two different Part numbers 2) Will the CEL turn on? 3) Will I need to purchase O2 extenders? I've heard yes because the sensors are in a different place on the 04s but could not get a definite answer.