IW STi Forum banner
1-1 of 1 Results
  1. 2015+ STI Discussion
    Need some help here guys, just installed bigger injectors, flex fuel kit, radium fuel pressure regulator about 3 days ago. Drive the car today and it has cylinder roughness on all 4 cylinders! Feels like a misfire and takes a while to accelerate. What would be the cause? car didn’t do this...
1-1 of 1 Results