I have the P0420 code on two vehicles and don't need to pass emissions. I have seen these things on Amazon:
https://smile.amazon.com/s?k=mini+catalytic+converter&page=2&qid=1594229187&ref=sr_pg_2
This makes me wonder if there is something wrong about the traditional O2 anti-fowler mod. I would think the O2 sensor will run cooler or something will be different that will affect the AFR measurement when using an anti-fowler. Like the sensor running cooler or the exhaust gases doing something weird inside the anti-fowler cavity.
Has anyone tried these, or has anyone had MPG decrease when using the traditional anti-fowler mod?
https://smile.amazon.com/s?k=mini+catalytic+converter&page=2&qid=1594229187&ref=sr_pg_2
This makes me wonder if there is something wrong about the traditional O2 anti-fowler mod. I would think the O2 sensor will run cooler or something will be different that will affect the AFR measurement when using an anti-fowler. Like the sensor running cooler or the exhaust gases doing something weird inside the anti-fowler cavity.
Has anyone tried these, or has anyone had MPG decrease when using the traditional anti-fowler mod?