Originally Posted by 05SubieRS
for all you guys running headers, especially the Borla UEL, are you running the stock cat? I am running the borla UEL, tsudo HFC, and a 2 1/2" cat back on my rs and am getting codes (P2096 and P0420), as my rear o2 doesn't seem to be happy. What are you all doing to be code free?
I have an '05 2.5 RS.
Stock cat. I have those codes too, but I just ignore it to be honest.