Hey guys, gonna be running a full turbo back exhaust and just wanted to know how many of the Cel Fix Kit or Defoulers am I gonna need to prevent a check engine light as best as possible until I get a tune. My Evo 8 is a 2003. Also can I put one into the stm downpipe I’m gonna be running to prevent a cell light or its not necessary? And I only need one or two by before and after the cat if I’m not mistaken. Thanks

 

You just need to install the defoulers on the O2 sensor right before the cat location. Thats how i have been running mine for the past 10 years. I also installed a catless exhaust without a tune and ran that for a while before getting tuned.