De-cat Downpipe.. what code to use?

[blue.taxi]

I also think to de-cat the damn downpipe in my EDM REX.... so can anyone show me which minimum code should I disable in the ROM file, which it will not hv CEL come on in later highway run?

TQ

[scotty]

DTC P0420

[blue.taxi]

Just this will do?? seem easy.... how about the rest of the DTC as I will take all the 2 cats (no dogs) in the DP.

Anyway thanks again....