BudgetPhoenix
Autocross Champion
My CCTA 09 GL has a gutted precat oem downpipe which I ran on eurodyne stage 2 for a while. I had several downpipes in the past but sold them. The gutted precat oem downpipe runs without issues on stage 2. I have also ran it with stage 1 and the stock file and to my surprise it doesn't trigger a CEL or the p0420 code after several hundred miles. Is the rear cat alone enough to keep codes away with these cars? I'm curious about other peoples experiences with this. I thought I would have to run an o2 spacer still on the rear o2.