OBD2 Vihicle J Style M18X1.5 O2 Oxygen Sensor Angled Extender Spacer K | JCarPartI changed both 02 sensors and still have p0420 and also the new cat from amazon did not work. I guess i need a better catalytic converter. as this is the only code i have or do the non fouler trick which i do not what to have to do.
Anyways i got it up to 10 psi and now it seems to lose boost as it gets closer to redline. it will go back as low as 6psi sometimes. other then that I am learning how to tune half throttle now and the car is running good so far. I also got 1 step colder plugs for ngk which is a 6.
I have an srt 4 with a catless down pipe and you could buy a j pipe to bypass the o2 sensor.
Like your build btw