Can anyone explain why my truck would throw a mass air flow code after mbrp install. Or is it just from removing the kitty? I have the 4" turbo back. I also had the egr blocked at same time then a few weeks later tried both the finger stick and ppe bypass both with same results. Check engine light is totally gone when i download my ppe economy tuner. For dealer visits i want to remove the tuner. Is there any thing else i should be installing?

Its from removing the cat. Some trucks get codes and others dont.