Discussion Starter · #1 ·
Just finnished installing some Stillen Long tubes, Berk pipes, and intake. Driving aruond for about an hour and SES light came on. Pulled code P0420 and 0430 cat inefficiency, then cleared them and codes returned individually at different times. Even with the Berk pipes should the truck still throw the code? Also going to get tuned this week wensday but was just wondering, oh and its on a super chips 91 tune currently.