I was thinking of doing this mod on my p300 2.0L to lower temperatures and have a little more sound.
I don't have gpf/opf since mine is euro 6b.
Has anyone put the 300 cell downpipe on the 4 cylinder?
I saw that the only one who does it is Ragazzon.

I know that I need to remap because the engine light will come on, but I will just disable the second lambda sensor and ask to make a very soft map to ensure reliability.

Any suggestion?

 

I think with an euro 6b that you def. Have an OPF !

 

I have double cat friend in this order: first lamda sensor, first cat, second lamda sensor, second cat