Hey man. I see you're looking for another car. I came and looked at your yellow vert you had. I finally bought me one. 03 vert with only 6k miles on it. Good luck in your search.
If it's on an 04 I believe the specs on it say the o2 extensions are needed. Are you lowered? I'm thinking of going with the prochamber for my borla stingers .I have bassani x now and just worry about ground clearance issues vs the x pipe I have right now. I'm lowered.