if your gonna run anti-foulers, you might as well install test pipes. you bought HFCs for a reason i assume? save yourself some time and money and read my other post. it's pretty common even w/stock cats for the o2 sensors to go bad and throw bad codes.

 

my check engine light came on. i checked the code and it was p2a03 which read o2 bank 2 sensor 1. They said it is because i took my cats out. I have test pipes with the non-fouler car drove for 2 months without coming on. They also voided my emissions warranty. I am going back to my original test pipes that didn't throw the code.

 

true bro. i said blank 1. so should i only change the one on that side.

 

I love how this guy just has some turbos sitting around. I'm jealous...