about 5k miles ago i installed a z-tube/pop charger, FI 300 cell cats, and borla cat back exhaust and recently my service engine light came on

me and my friend cleared all previous self learning and idle air learn

it went away for like maybe 200 miles and the service engine light came back again...

same code (cats aren't working properly)

it's just i hate having my car not running properly. any suggestions?

 

maybe your o2 sensors are damaged. If not do you still have your stock cats? If you do put them back on and see if anything changes. GL

 

Aftermarket high flow cats have a much shorter life than oem..........most do last 12/12k as that is their warranty.